IF we're judging this by who wins in a fight, then I have to go with The Night Watch. Buffy and Blade can take the other 5 on their own. Although I love the characters on Let's Talk collectively a hell of a lot more.
Arguing this in a thread where I'm not talking about my own team - I'm a strong vote against the win-in-a-fight metric. There are plenty of characters that are just super-duper-mega-powered in their canon, and it would be silly to say "Draft Sentry and you win!"
Is John Wick enough to overcome the HUGE pile of suck that is the rest of that team? No, no he is not. Even though Lisbeth Salander is the only one from that team I've heard of, Heroes of Tomorrow moves on here.