What? Lil bro lives in another dimension

Not really, but they are alternatives to each other. Bottles can also be configured to run “normal” applications alongside possible games and stuff, while Lutris has more a “gaming” UI vibes (but you can run everything you want on both of them really) and additionally provides some integrations for other emulators. I think it comes down to personal tastes at the end of the day, both of them under the hood use wine/proton and apply settings to it before running the application