Pegasus is my go-to but it takes a bit of tweaking and learning. It's kinda like the arch of frontends; very versatile, lightweight and customizable, but also a bit of a learning curve. Steam games get added automatically, but with other emulaed or wine games you'll need a scraper like Skyscraper or you can edit the metadata files yourself. You can also point to bash scripts to do essentially anything you want on the OS side. Launch anything, any emulator, any game, any bash script, wine, whatever your heart desires.

There are also tons of themes in every style, my top pics are Retro Mega Next for browsing and Library for a grid layout. It is also natively built for use with controller so it is easy to use. It's also cross platform, I currently use it on Fedora, used to use it on Windows and have also used it on Android and Steam Deck. And if you want to go even deeper than that, it runs on QML, and you can customize any and every sigle part of the launcher and frontend with the QML files or even make your own theme. The rabbit hole is deep and very fun to explore and it's such a flexible frontend