Is Muay Thai effective in a street fight?

I wanted to take a martial art that has more powerful techniques than Krav Maga. I took Krav Maga for five years, but I never got the kind of counters or training I need to win a street fight. I'm not satisfied with it because, I was not trained well enough. It was a good introductory to fighting, but wasn't something that would make me a superior fighter or very aggressive.