Which one should i play?
BG2 seems so much more fun than BG1
I didnt beat BG1 yet, but it BG2 seems there is alot or more things to try and do.

Bg1 was a bit more simple , In Bg2 have ALL characters Quests and in Bg1 are more characters to chooce about , In Bg1 around the 25 , and in Bg2 around the 15 , and there are many Items that only can be used by one NPc. But Bg2 is better then Bg1 .

bg1 seems alot bigger to me than bg2,

That's because you could explore every inch of the map to search for things. I dont think there are all the miscellaneous wilderness areas to explore like in part one, which isn't a big deal because wandering through the same woods got very boring very fast.