Vergil's not a better Dante, I wish people would stop saying that. Dante's still the better twin, Vergil just seems better at the moment because he's a lot easier to use and most Dante mains have to relearn new combos and timings due to his tweaks.
Vergil has insanely laggy normals, and while he can make himself somewhat safe on block with teleports or I think Rising Sun into Teleport (think that's like...-3, -4?), if he whiffs a big normal, he's screwed. Dante doesn't have it as bad.
Vergil's a good character, a very good character, but I think people are riding him a BIT much right now. I think the old guard of Top Tiers are still the bigger threat right now along with Spencer and Firebrand.