Echoing the other comment, I came from reddit and Sync was the only way I knew that site. Used Sync for about 7 years.
I like LJ as a dev, I appreciate the way he interacts with the community, and I love the app. For me it's a no-brainer to give him support because I use his product as much as I do.
For features: incredibly customizable material design. Extremely fluid. A lot of view customization. Comment drafts are something I missed on voyager.
Paid exclusive features: Cloud backups, user specific highlighting and theming, pull text from images, translate text, saved post folders (coming soon). No ads (yes the other apps don't have ads and are generally free).
Is there a lemmy or reddit app that ever served ads (Other than the official reddit app)? I thought that was one of the reasons for reddit killing 3rd party apps - they couldn't push ads?
Most of us come from the reddit app, it just has a clean and good setup with great settings. The subscription is mostly to support LJD, on Reddit it allowed for cloud backups of settings and reddit specific features.