I'll go either way, depending on the game. For Koihime, for example, I'll play it either way, since I already know the basic story, and actually playing the game is easy enough. For something like, say... though older, and now translated, Tsukihime... Better yet, maybe Umineko, I wait for the translation, because I like to know what's going on when I read something.
Also, no walkthroughs unless I get really, really stuck somewhere. They I just do it out of frustration. Those moments are far and few inbetween, however.