If you want functional online, the Switch version of Puyo Puyo Champions is the only title worth bothering with. Specifically Switch, other platforms are ghost towns.
If you want singleplayer content, 15th Anniversary, 20th Anniversary, and Chronicle are all peak. None of these games were released outside of Japan and they're older titles you'll have to emulate, hence all my salt about the state of things today, but at least they do have fantranslation patches.