Technology

Because my games library is much bigger in GoG than Steam, I've been using Lutris alongside the Steam App from the start (for over a year now) and the rate of no-hassle success I've had is just as good as with Steam and the whole process of installing a game from GoG and running it is just as slick in Lutris as doing so for Steam games in the Steam App.

Further, Lutris is much more open and flexible than Steam, so for example I've configured it to by default run my games inside a firejail sandbox with localhost-only networking, I can install games from many sources and formats rather than just digital distribution from a specific game store and it's even perfectly possible to run pirated games with it (one of my Steam games won't at all run in Linux, but a pirated version of it works just fine from Lutris), none of which is possible with Steam.

The actual gaming is just as seamless with Steam as with Lutris, but Steam is purposefully a closed solution highly integrated with a single games store, so it's way more restrictive about what you can do with your games than Lutris (which follows the open source ethos, up to and including having a ton of obscure configuration options)