It's pretty much down to these 2.
Edit: Alright, I got enough info. Time for fun. Don't worry, I don't plan on doing this very often.
[i]Well?[/i]
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I would've thought it'd be a landslide vote for defender. I run into sunsingers and shit, they are lethal. Way more so than a bubble titan. I'm saying both are average skill players, all things being equal. I don't have a warlock(that i use) so i can't speak from firsthand experience. perhaps i know not of the difficulty of using that subclass