I'll answer based upon by excellent experiences with Central Control.
1) No Streamdeck software needed. You can use Companion, if you wish, but are not obliged to.
2) Ease of use, multiple devices, as you noted feedback, remote system control, control of TriCaster audio from a physical device, lots of other devices supported, etc, etc, access to its wonderful developer, I could go on and on.
3) Free eval for 30 day. Then a whopping $50. Quoting another user, best money ever spent (and I'll add, not much $ at that).
Fritz Golman
Museum of Broadcast Communications