Depends. Sometimes i would like western over eastern but that is if it has an urban, or hip hop kind of flavor to it. Most of the time though I go for western art that still has some elements of the japanese style in them. Then there is Korean and chinese but i dont think that is on-topic anymore ^^x
none! i'll go for Pinoy style! hehehe' like the works of Whilce Portacio~ I dunno if it's categorized with Western style since i think it's a totally unique style. Also works by Inoue Takehiko(Slam Dunk), and Oku Hiroya(Gantz) that displays the same quasi-realism art style.