Value of Joker options
Blue burst is more valuable for simple reason. Let's compare them

Blue burst:
+ It's more certain to hit than gold burst
+ It gives +1 card advantage
+ It makes you immune to damage
- OR -
+ It gives you card advantage over opponent that thinks you are bluffing

Gold burst:
+ It's less certain to hit than blue burst generally 50% case.
+ It can give opponent chance to retaliate for free
+ It gives +1 card advantage, while it gives +2/3 card advantage compared to power-up (3 cards for 2 aces)
- Other cards can achieve similar effect, and can recur more often.
- If you lose your opponent is almost guaranteed to gets some free damage in.

With blue burst, you win whether opponent does something or not (assuming you played a Joker). With gold burst it's a bit more all-in.