Well, the gels are certainly fast acting and they have that going for them. I know a lot of people that can't get over the mouth "feel" of them. I suspect it takes some acquiring and adjusting for some.

I have my favorites though!

At the top for deliciousness:
Carb BOOM! Raspberry
CLIF Raspberry
CLIF Mango

At the top for performance:
Gu (any flavor, but tri-berry and chocolate are good... I bet they'd be good together!)
Powerbar gels