The Jaguar controller is
NOT larger than the PSX controller. Get out a ruler and measure the width across both. They're the same. The Jag's center part is filled in with the keypad and that makes it look bigger than the PSX's which is open in the middle. If you can grip a PSX controller just fine and can't grip a Jag controller comfortably then the problem is in your mind, not your hands. The Jag controller freaked out gamers too young to remember the INTV, 5200, CV. I remember the constant comments, "whoa dood, how am I supposed to push all dose keypad buttons while playin a game dood?!". As if every game for the system uses the keypad when it was really just the PC ports.
I like how the Jag pad design was reviled as "horrid" and the N64's tri-pronged z trigger mess was "genius".