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Steam probably.
I won't say it's "best", as I just want to run a game without friendlists and other bloat, so I really hate the fact Steam is nessesary for so many games.
But I would call it "essentiall".
Yup, as time went on, I simply felt less need to have proprietary software on my system. Steam remains as an exception; simply by virtue of having no F(L)OSS alternative (AFAIK).
Steam itself isn't that special and things like Heroic exist but where Steam wins is the ecosystem. Also Valve sponsor developments of Linux desktop technologies, so even if Steam itself is proprietary, some of the money ends up advancing open source.
Valve has put a lot of work into helping WINE & Linux. Even if it was a selfish play to break free from Microsoft & other app stores to lock those into their marketplace fee, I can’t help but be grateful for the better ecosystem & uptick in users. Since they are privately held too, they aren’t in the same business of chasing quartely profits or making the experience worse & worse by selling your data & slapping ads everywhere.