From HollywoodLife:

Lindsey asks Stephen Moyer, Kellan Lutz and Paul Wesley, which vampire cast would win in a battle for blood? Who do you think?

It’s time to spill some blood! We caught up with three vampires – one from each cast — Stephen Moyer, Kellan Lutz, and Paul Wesley — at Cosmopolitan magazine’s “Fun Fearless Male Awards” at The Mandarin Oriental Hotel in NYC on Mar. 1 and they admitted there might be some ass kicking involved if the three casts were ever to fight. And who would win? True Blood’s Stephen Moyer thinks, “We could take both of them [Twilight and Vampire Diaries] down at the same time!”

Twilight’s Kellan Lutz agreed that True Blood would carry the deadliest stake: “I think True Blood would kick all our asses. Eric on True Blood) would kick all our asses. He’s a bad ass on the show.” But, he continued, “Really, who knows. We all have different strengths and powers.” For the Cullen clan, “you have to rip us apart. That can be tough if you [don't have] super human strength to do that.”

Full article here

I agree with Kellan. Eric would definetly kick all the twilight vampires asses LOL
But the Cullen may have an advantage because of their skin, being able to go out in the sunlight, and the TB vampires die when staked, and burn in the sun…

It would be an interesting fight to watch… XD

I think Kellan is right, but only in a fair play LOL
Because the twilight vampires don’t have to sleep, they don’t die when staked (I don’t even think they can get staked at all) and theu don’t burn in the sunlight…
But if the fight was at night, with no weapons… Eric would kick all the Cullens’ asses FOR SURE. =D

AHHHH, I thought the comment hadn’t appeared, so I wrote it again ¬¬’

sorry ._.

I think the Cullens would win because of all the attributes you mentioned, plus, the Cullens have unity. The VD (hahaha!), and TB vampires are very divided.
Eric couldn’t beat Emmett’s strength, and Edward’s mind reading, and Alice’s premonition, AND Jasper’s mood control. He just couldn’t. Just sayin’