[rerednaw]

As someone who has played and run both systems since 1st edition...just my 2 coppers.

Pathfinder is a setting expansion that uses the d20 system.
GURPS is a system that has different settings as expansions.

As for complexity, both systems may get extremely deep.

I strongly agree with sticking with GURPS simple fantasy or the self-contained DFRPG (NOT Dungeon Fantasy splatbooks for GURPS, that is a different animal) at least until you cut your teeth on the system.

One thing to keep in mind with GURPS is that there are many more ways of doing the exact same thing in the GURPS system than there are in Pathfinder.

Also GURPS you CAN do everything...but the cost is much higher as everything costs more 'points' to do as opposed to be granted once you hit a certain level. GURPS doesn't have class levels. Or classes for that matter.

Anyway welcome and enjoy the ride!