Invincibility. I pick this power because no one can harm you or do anything to you. Also if your invincible how are villains suppose to fight you or hurt you. So as an example there have been loads of fights between heroes and villains like infinity war, spiderman homecoming, and the final battle of marvel ''ENDGAME''. Endgame was the hardest battle ever. They needed to go back in time and get crystals and they only had one shot to do it and if you're invincible you can defeat Thanos so easily since he cant hurt you or kill you so i would be invincible because other superheroes don't need to die just to save the world like Black-widdow Iron-man they died saving the world. I would also have and invisbility cloak so I could turn invisible when ever I want and a hero costume that gives you strength so if I had invincibility as a power and a costume that grants you more powers would be the best.