You're comparing two different security extension ideas, one on real-time page scanning and one on community experiences. Use both, they won't conflict as WOT blocks pages later than BitDefender TrafficLight. I also reccommend Adblock Plus or AdGuard, and Disconnect.
In theory, BitDefender TrafficLight will be better than WOT, but WOT is made up of hundreds of thousands of people contributing while Bitdefender is made up of only Bitdefender staff. So, 100,000 or around 100? However, TrafficLight steps in much earlier than WOT, and while WOT slows down page loading speed, TrafficLIght doesn't.