Seems like every week over on GamingOnLinux there’s an announcement of a new launcher.
Personally I only use Steam & Lutris. Lutris for my gog games and BattleNet, Steam for everything else.
I don’t know of a good reason to use Heroic, or any of the other new ones over Lutris / Steam, but maybe I’m missing out.
I only really use Steam myself anymore, now that I’m gaming primarily on my steam deck. That said, I understand that Bottles is the most compatible solution for Battle.net support, so I may add that to my list down the line. I have nothing against Lutris, I used it plenty in the past, I’ve just moved past needing it for the most part.