It used to be 50/50 for me back when I had a lot more spare time. Nowadays, being older and slower, time and energy are an issue so I definitely lean towards the player side.
I will say that in every instance where I ran a game or played a game with someone who was primarily a GM, my thought afterwards was "I'd rather not play with this person again".
I will say that in every instance where I ran a game or played a game with someone who was primarily a GM, my thought afterwards was "I'd rather not play with this person again".