I've only played one of the PSP ones and got lost and stopped ever since. Which is your favorite? I may get it
I've played Freedom Unite for the PSP and Tri for Wii. I can't say I have a favorite since they are both completely different in terms of monsters and locations and such things, but I've only played Tri due to my PSP being broken. So I'd say Tri.
My brother and I used to play Monster Hunter Tri a lot. it was amazing for about a year, then it got old fighting the same stuff so we moved to vindictus