well, in terms of games, the X8 has a 1200 mAh battery while the LGOO has 1500 mAh's. thats going to give you some more battery time to play games. and as an owner of the LGOO, i can say that games look fine. even if the X8 has more colors, I dont think you'll see much of a difference if the games arent made to take advantage of the higher color range.
another thing is the X8 uses a skinned version of android while the LGOO has a pretty stock version of 2.2 with most of the original features. if you like time scape, then cool, but i personally dont like it at all.
HTC Touch Pro 2 > HTC HD 2 > MyTouch 3G > Motorola CLIQ > Motorola CLIQ XT > LG Optimus T > iPhone 4 > Droid Incredible 2 > LG Revolution > Galaxy Nexus > Droid 4 > Galaxy S III > Galaxy Note II > Droid Maxx > Xperia Z > Moto G > Moto X > iPhone 5s > LG G2