Extrusion pasta maker versus roller: which one makes the best pasta?
I am absolutely of the opinion that the roller type makes better pasta unless you're considering hugely expensive commercial extruders. 

This is my pasta maker:



I think I spent about $30 on it. I make my pasta dough in my food processor, and the pasta is as good as I have ever had. Yes, it requires that you knead; that's half the fun and it produces much, much better pasta.



I had one like this once:



I did not like the pasta. I found it to always have a grainy texture, even if I used 00 flour or followed the recipes that came with the machine. The machine just doesn't knead enough or right or something. That one cost $250 I think. The only reasons to prefer this one to the other is if you want shapes (I prefer noodles and ravioli anyway to macaroni), or if you really, really hate kneading.

See: Can anybody help make homemade pasta foolproof? for two different, both excellent, methods.

Since you had me looking on amazon anyway, I'll show you the one I would buy if I was in the market and didn't mind the idea of spending a little extra money: Marcato Pasta Machine with Attatchments. This one is the bestseller for good reason: Marcato Pasta Machine. This very inexpensive option has been fine for me, but I sometimes wish I had one of the higher quality Marcato rollers. It's a bit rough around the edges, especially cutting, but it's functional. Norpro Pasta Maker.