One of the features that OBS dont have and slobs does, it's the possibility to record selective sources, it's very usefull when streamer wants to record only a clean gameplay footage and webcam only, without overlays or alerts etc.
Elgato has the possibility to use green screen on stream and...
Stream and record at different frame rates
Stream and record with or without overlays, alerts, etc ("isolated recording", or "selective recording")
Record 120+ FPS with multi-track audio (unsupported!)
Set up a "panic button" to prevent banned words and pictures from being...