1.e4 or 1.d4?

I play both like the top seed. This would also be my training‘s recommendation.

I'm learning the KID for real... so much theory and lines... but i started to play it and i'm loving it. I switched from slav to KID in lichess and i'll give it a try for real otb soon.

e4 is not a legal move, if his opponent has played 1. e4