So I've finally hit 90, and throughout leveling I've been dual wielding. As i often do when i hit 90 on a character i go to Icy Veins and here to check up stat prioritizing, etc. And to my dismay, it seems that 2h frost is better dps overall, and I'm wondering why. Is it because of the hit cap? Or the burst? Icy Veins says that 2h is just better single target while dw shines on cleaves and aoe.
One thing i noticed when raiding on my priest was that most frost dk's use a 2'her. I always thought that it was just preference more than anything. I know for me it's mostly preference to dw. I started dw frost tanking back in wrath, so I always just kept it that way when i began leveling again. And i know i shouldn't go by anything really below heroics or under lvl 90 but I watched my dps as I leveled through, and I've always seemed to be able to keep up or top dps meters(i realize there are tons of variables to that statement). This is also while i was throwing interrupts in and watching what was going on...which seems to lack a lot lately with most players.
So tl;dr: How big of a difference is there in dps? Is it enough to hurt me noticeably or is it within reasonable range where i can keep dw-ing frost?