Question [Q] need some help

guys...i need someone who can guide me to buy a smartphone...i am getting confused...which 1 to buy lg optimus black or samsung galaxy sl gt-i9003??i m spending my hard earned i dont like my phone to become paper weight after few days or preferences are:

1.pretty good gaming xperience
2.good browsing xperience
3.decent audio quality
4.good multimedia features and lastly...
5.regular software updates

i want this question to be answered by a person who has used and has felt both optimus black and galaxy sl...both hav same chipset and der is a little has
come down to dis...which is better optimus ui 2.0 or touchwiz 3.0..pls help...