By quickly searching it seems the Morningstar MC6 has some things better and MM some:
MM:
- 10 “presets”
- One expression pedal
- Bluetooth to host
- Press, release, toggle
MC6
- 30 presets
- Two expression pedals
- USB to host
- Many more press, release, double tap, hold, etc
Personally I’m happy with MM especially with the Bluetooth, but I’m having second thoughts as the MC6 seems to be better in all other fronts 
I’d guess that modifying the presets through USB is a lot faster than through Bluetooth low energy that the MM uses 