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.

I switched because btop provides vi-like keybindings. For htop I think you have to use a fork to get that.

Enhanced stats reporting really. Shows you processes, network throughput et cetera.