I really like both of them. Lampent is sort of meh, but Litwick and Chandelure make up for it. I've never actually used a Gengar (mainly because it's a trade evo, and I haven't had too many opportunities to get those), but I've always sort of wanted to. I did use Chandelure and it worked quite well for me.
I'm going with Gastly, because ... I was indecisive and asked for someone else's opinion, and he voted for that one.
If you actively hate Justin Bieber... then you don't know what "intended audience" means. Hate Twilight instead, it's far worse.
Hmm, Litwick line has the numbers and Gengar looks like a little fat man, but Haunter is just awesome. ...despite Haunter's awesomeness I'm gonna go with the Litwick line, since Litwick itself is pretty cool while Gastly is just a blob.
The man in black fled across the desert, and the gunslinger followed.