"PC players have a bit more choice," Rosier said, as reported by GamesRadar.

He pointed to Steam as an easier starting point for indie developers, who can reach players there before expanding to consoles. He also cited greater variety, mod support, different control options and a strong free-to-play market on PC.

Rosier added that more developers, especially in Asia, are investing in PC. PlayStation and Xbox, by contrast, are seeing slower growth than PC and mobile.

These are the analyst's views on why the gap exists; the sources do not include the underlying growth figures.