I picked X-2, X, VIII, VII, and IV.

I liked X-2s idea of being able to change classes during battle, and I like not having to wait turn after turn.

X's sphere grid system was kind of fun, yet extremly tedious. I also liked the CTB, it gave me time to think.

VIII's junction system was just kickass. It made tanks out of my guys quickly.

VII's materia pwns for now and eternity

I liked being able to use 5 guys instead of 4 or 3, which is why I picked IV.