EDIT: Fix grammar mistake.
Usually, Flatpaks. My generally philosophy is that if it isn't in Debian, it probably won't last. I make exceptions when something is the best tool for the job, like Tom J Watson's Emote.
This isn't rock solid, I admit - there are plenty of defunct projects that were once in Debian repos (neofetch is still in sid), and there are plenty of lasting projects outside Debian.)
Fixed that little goof up.