Sync for Lemmy is my daily-driver, but I also use the pwa (Voyager/wefwef), Liftoff, and Connect.
Yep, 4 apps for browsing Lemmy with, and I love them all for different reasons. I've used Sync for years and had no problem paying to get rid of ads - so many hours of entertainment have been facilitated by Sync, and I appreciate that enough to pay for it.
Nothing super dramatic, honestly. I'm really happy with the level of polish/finish in S4L, and the rate of releases that the dev has been keeping up since moving to Lemmy. I really didn't use reddit without Sync (or RES if on PC), so it just feels right given how similar the platforms are. Sometimes I just want to change it up without spending any time in settings menus.
Also, sometimes I just feel like looking at the vaporwave-dark theme in the Voyager pwa. I haven't used Liftoff much since Sync came out, but I did a lot of app-hopping when I first got here and I guess the habit stuck!