The good and unique thing about Lutris is that it has a bunch of user-made install scripts that make Wine/Proton installation much easier, often with only a few clicks.

Heroic on the other hand is almost exclusively for the Epic/GOG/Amazon Luna stores. It does however have a way of installing a non library game in its own Wine/Proton prefix, but it doesn't have the install scripts that are often required for extra tweaks and changes that are needed to make some titles playable.

The only added functionality, the easy creation of Wine/Proton prefixes and the Wine runner manager, can also be found in Bottles. So I wouldn't call Heroic an alternative, as both Bottles and Heroic only offer half of what Lutris offers.

Faugus Launcher is amazing. Would highly recommend.

Heroic is far better. IMO lutris sucked and sucks.