Telekinesis:
From the standpoint of combat, it's most effective since it doesn't matter much how strong your opponent is (unless they could fly I guess) cause they would be at your mercy if you were just to levitate them. Also, you could neutralize the most opponents in the shortest amount of time.
You could also control minds and uh...that's like super powerful actually. Like imagine what you could do in this world if you were a sufficiently powerful telekinetic.
Imagine if someone with evil intents were to have these powers. Frightening isn't it? It's not just being super strong or having laser eyes, you could take control of entire persons.
From a fun standpoint, you could fly, just move stuff with your mind, and potentially create micro-black holes (I still need to do more reading on that part cause it's extraordinarily interesting and still applies to the real world).
Yes I've thought a good deal about this.