Muay Thai is a bit more about aggression compared to kickboxing. Not a bad thing, just different. I did kickboxing for a number of years and enjoyed getting my energy out. As for what's better in the street? Not really sure. I might be inclined to say Muay Thai probably for indoors where going in would be better but kickboxing probably for outdoors with more space? You keep your distance more in kickboxing which is less valid in an indoor fight but all the movement is pretty valuable with plenty of space.