Here is a comparison of all the highlighters I have (what can I say, I love highlighters!), as well as my favorite brand for each color.

Yellow:  Staples Hyper & Faber Castell wins hands down.  Super bright and fluorescent.
Orange: Zebra Zazzle and Staedtler Textsurfer (w/ the liquid ink barrel).  Exactly the bright orange I love.  Not too dark, not too light.  Staples Hyper comes very close!
Salmon: Not many highlighters come in this color, but of the 3 that I do have, I like Stabilos.  Slightly darker than Staedtler, but not as dark as Zazzle.
Pink: they all look the same to me.  No favorite
Purple: they all look the same to me.  No favorite
Blue: they all look the same to me.  No favorite
Dark Green: Stabilo wins for being light but yet bright enough to stand out on paper.  Staedtlers is a bit dull color, and Zazzles look too dark
Lime Green: Definitely Faber Castell.  The perfect bright lime green color that I wish all green highlighters would look.

Staedtler Textsurfer  I don't know if its just my pack or it happens to all of them over time, but when I tested them out today, the colors look a bit faded and lighter than what I remember it to be.  Just comparing this set of Textsurfer to the single liquid Staedtler Textsurfer orange I have, you will see the huge difference in the vibrancy.  I do like the shape of these highlighters and how they feel on hand in general.

Zebra Zazzle  liquid highlighter set that I brought over 10 years ago at Staples.  Still works just as new today, though they haven't gotten much use at all.  I don't really like liquid highlighters that much though because they tend to run out very quickly with regular use.

Stabilo  the newest highlighter set I purchased just this past week and what compelled me to write this review. Very beautiful and vibrant colors.  I don't like the cap that much though because it takes some effort to pop the top off without any grip, especially when your hands are lotioned up.

Staples Hyper! - Best Highlighter for the Cost.  On sale during back to school season at 6 for a $1 and their colors are quite amazing as well.  Their yellow and orange are one of my favs, and I also rated all brands pink, purple and blue equally.  Green doesnt look bad either when not compared to other brands.  Why pay $11-$12 for other brands when you only need to spend $1.  GREAT DEAL!

Faber Castell  I love this brand and how the highlighter feels on hand.  I rated yellow and green as my favorite.  Orange would have been a favorite too if it worked normally; it is drying up and streaky when highlighting.  This brand is impossible to get in the USA; and I had to order from international sellers.  The first set I received, 2 of the 4 highlighters were dried up.  The second set I received, it was ok when I received it, but upon testing it this week (I ordered this just a few months ago), it seems like the orange is starting to dry up as well.  I cant say if this is normal of all Faber Castell highlighters or I just brought from a bad seller.

Sharpie Accent - Least Favorite Brand.  Sorry.  Their colors are darker and duller than all the other highlighter brands I own or tested.  Even when not comparing with other brands on one page, their colors looked much darker like markers rather than highlighters.  Unfortunately, this is also the only brand that my office orders, so I just use their yellow and then buy my own Staples Hyper! Highlighters for office use when I want to use other colors.

BIC  also not really a fan, though I don't dislike it as much as I dislike the sharpie accent.  Doesnt last very long.
Here is a comparison of all the highlighters I have (what can I say, I love highlighters! ), as well as my favorite brand for each color. Yellow:  Staples Hyper & Faber Castell wins hands down. Super bright and fluorescent. Orange: Zebra Zazzle and Staedtler Textsurfer (w/ the liquid ink barrel). Exactly the bright orange I love. Not too dark, not too light. Staples Hyper comes very close! Salmon: Not many highlighters come in this color, but of the 3 that I do have, I like Stabilos. Slightly darker than Staedtler, but not as dark as Zazzle. Pink: they all look the same to me. No favorite
Purple: they all look the same to me. No favorite
Blue: they all look the same to me. No favorite
Dark Green: Stabilo wins for being light but yet bright enough to stand out on paper. Staedtlers is a bit dull color, and Zazzles look too dark
Lime Green: Definitely Faber Castell. The perfect bright lime green color that I wish all green highlighters would look. Staedtler Textsurfer  I don't know if its just my pack or it happens to all of them over time, but when I tested them out today, the colors look a bit faded and lighter than what I remember it to be. Just comparing this set of Textsurfer to the single liquid Staedtler Textsurfer orange I have, you will see the huge difference in the vibrancy. I do like the shape of these highlighters and how they feel on hand in general. Zebra Zazzle  liquid highlighter set that I brought over 10 years ago at Staples. Still works just as new today, though they haven't gotten much use at all. I don't really like liquid highlighters that much though because they tend to run out very quickly with regular use. Stabilo  the newest highlighter set I purchased just this past week and what compelled me to write this review. Very beautiful and vibrant colors. I don't like the cap that much though because it takes some effort to pop the top off without any grip, especially when your hands are lotioned up. Staples Hyper! - Best Highlighter for the Cost. On sale during back to school season at 6 for a $1 and their colors are quite amazing as well. Their yellow and orange are one of my favs, and I also rated all brands pink, purple and blue equally. Green doesnt look bad either when not compared to other brands. Why pay $11-$12 for other brands when you only need to spend $1. GREAT DEAL! Faber Castell  I love this brand and how the highlighter feels on hand. I rated yellow and green as my favorite. Orange would have been a favorite too if it worked normally; it is drying up and streaky when highlighting. This brand is impossible to get in the USA; and I had to order from international sellers. The first set I received, 2 of the 4 highlighters were dried up. The second set I received, it was ok when I received it, but upon testing it this week (I ordered this just a few months ago), it seems like the orange is starting to dry up as well. I cant say if this is normal of all Faber Castell highlighters or I just brought from a bad seller. Sharpie Accent - Least Favorite Brand. Sorry. Their colors are darker and duller than all the other highlighter brands I own or tested. Even when not comparing with other brands on one page, their colors looked much darker like markers rather than highlighters. Unfortunately, this is also the only brand that my office orders, so I just use their yellow and then buy my own Staples Hyper! Highlighters for office use when I want to use other colors. BIC  also not really a fan, though I don't dislike it as much as I dislike the sharpie accent. Doesnt last very long.