Ive always been partial to Shotcut for proper video editing, but I also use HandBrake for simple tanscoding jobs.

Honestly I’ve got the kids bedroom tv on a Pi 3 running LibrElec just fine. Kodi isn’t that resource intensive so it works great. But if you’re feeling fancy setting up a db to hold all your info so you can share it on multiple end really is nice. I love being able to stop a movie in the living room because I’m getting tired and pick it up in the bedroom at the exact same spot.