Switchology - literally CRJ
Fly by wire - much more natural feeling and more responsive than the A320
Cockpit - never flew the 717, but the 737 flight deck was terrible IMO. Ergonomics were not a concern in 1962 - THEN they figured out how to shove your bulkhead another few inches towards the panel to move the galley and make more room in the cabin. The C Series is Airbus comfy and even quieter.

My C Series experience is too limited to say much about how it is to fly. Maybe some others can chime in.

Friends have told me it is a bit underpowered and quirky as hell to get it's systems all working.

The 737 is amazingly reliable. Of course it may be that the CAS (six pack) is just such crap that when it does break the pilot isn't even aware.