The Orr Group, the company behind Roll20, have just released their latest set of stats and they show that just over half of all users play D&D.
Last quarter 51.87% of Roll20 campaigns were D&D 5e, and 55.48% of all accounts played D&D. This quarter there’s been a slight dip, 45% of games are D&D but 51.21%, more than half of accounts, played the game.

Call of Cthulhu is partly responsible for the difference. 18.28% of campaigns played CoC (any edition) compared to 9.48% the quarter before. That’s nearly double.
Homebrew games and those who don’t fit Orr’s system are in third place with 13.92% of all campaigns, Pathfinder 1e in fourth is 5.72% and Warhammer next with 1.41%.
Savage Worlds is way down in 15th position with just 0.42% of campaigns played. This puts Roll20 in a different position from its main competitor, Fantasy Grounds, where Savage Worlds was a top 5 contender every month, usually in the third position.

There’s more info on Roll20’s own blog.