I am mostly a DM with a rare opportunity as a player. Most of the people I game with (and have for decades) don't DM because they don't see the appeal, or the amount of work is too much (heck, one player can't be bothered to read his own class between sessions let alone DM )
I started DMing because no one else wanted to (one of my friends did it, but to be frank she wasn’t great at it, and a big part of that was because she really didn’t want to be doing it.) But I soon realized that I enjoyed it quite a bit, and at this point prefer it to playing. I do still play from time to time, and I do enjoy it, but not as much.
Nowadays I DM about half of the time and play half the time. It wasn't always this way, but I've surrounded myself with great players who later become great DMs which affords me more opportunities to play.
I am forced to vote "Other." There is nothing closer to "Usually player, sometimes DM". We have 5 people in our group and rotate DMing so I DM like 20% of the time in aggregate.
I hate to be the guy complaining about missing poll options, but I'm surprised that the poll includes player always, DM always, mostly DM, and 50/50 were present... but the fifth option for mostly player and occasional DM is missing.