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.
It’s more convenient than Lutris for installing adhoc games, or multiple games in one bottle. Don’t get me wrong, when Lutris works out of the box it’s great, but oftentimes there’s no recipe on Lutris for a game (eg when they’re relatively unknown or new games) or the recipe is severely dated.