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 guess it depends on where your games are. I have a few games on epic and gog, and for that Heroic works great. So personally, I just use that and steam. The nice thing about heroic is that it lets me select steam’s installed proton versions, so I don’t have to install proton multiple times.
At the end of the day though, if you can launch the games you want to play, stick with what you got.