only proprietary, ad-infested client
There are a handful of them, Sync and Boost have ads / ad-free versions and Connect was closed but without ads from what I remember. I'm not familiar with the rest of the closed source ones
I keep Voyager installed as the FOSS alternative, and then the rest I add and remove every now and then to try out.
Boost and Sync are popular because people coming from Reddit have used them for years, and are familiar with the interface / dev. If it helps them get familiar with the fediverse then I'm all for it