Upvote for SC2. People always talk about it being difficult, but that’s only the competitive ladder. There’s so much single player campaign, challenges, co op, and arcade custom map modes that you can play for ages and never even feel the need to touch competitive play.
This is by far the most confusing part when I consider switching over - which one to get? Primarily Steam gaming, but I saw someone mention the Nvidia cards I have might not play nice.