I recall thinking that the dude in LA looked like a caveman while the dude in LA2 reminded me of Conan the Barbarian.  Nothing against cavemen; Bonk's an alright guy in my book, but Conan's a cool guy too.  I
I've debated a bunch on which game I enjoyed more, never came to a clear answer.  They're both good, if you haven't played much LA2 then you should do so and see what you've missed out on.