Lots of quality of life changes. Maybe some of them can be done in htop but with btop it's right in your face:
- CPU usage graph (global and per cpu)
- CPU temp + graph
- GPU usage
- Memory graphs
- Disks space infos + real-time IO
- Network graph, one for each network device, upload/download stats since opening the app
- Per program cpu graph, memory graph
You should try it.