At any given moment, i would have to say vampires. They're CONSTANTLY a danger, in the sense that they are always thirsty. If they're trying to resist, they can snap at any strong temptation (Taking note of the Jasper incident). You're in constant danger, even if the vampire isn't trying to hurt you.
When it comes to werewolves, I'd say they are only dangerous while phasing. They have complete control over their actions while in human form and 늑대 form. They're not really dangerous unless they intend to hurt you. They are human protectors, after all. The 늑대 only exist to protect the humans from the vampires, not the other way around.
I would have to say vampires. Namely because they can pass themselves off as human and can get close to 당신 and lure 당신 into a false sense of security. 늑대인간 when they are at their most dangerous, 당신 can flat out see that they are dangerous and stear clear of them.
Its really opinion driven. Of course, asking this question, 당신 will get good 답변 for some, good 답변 for others, and bad for some and others, and so on. I personally say vampires, not just the Twilight vampires, but Dracula, Vlad the Impaler, and so on. So many of historic people (such as Vlad the Impaler) were dark and twisted and then there is the werewolf legend for The Beast, the wolf, etc. So whatever 당신 choose is basically oponionated but I personally say Vamps FTW!! (for the win)
Both can be very dangerous. I don't think that one is 더 많이 dangerous than the other. But if had to decide, I'd say the 뱀파이어 are 더 많이 dangerous since they have special powers which the 늑대인간 don't have.