I like both. The curs we had would run you to death though. Treed and killed lots of squirrels and coons. Good if you were in the mood to walk a lot.
Although I like the curs, if you just want to have fun and shoot squirrels, I recommend fiest. Our fiest range good, but don't run you to death. I believe that mountain curs over run lots of squirrels that are near by. Fiest, typically, do not range as far.
As said earlier, if you wanted to try coon hunting too, go with the cur. I think they have better noses for trailing cold tracked coons, and stand a better chance with the fight of a wounded coon, although I have seen some viscous and entertaining fights with fiest.
Just get what you think fits you, hunt it alot, and have fun with it.
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