Are 2 days better than 1 day in Dubai?
If I did option A then MXP and DXB/AUH would be rather aggressive. Maybe something like this:
Arrive MXP 11:15am and rent car.
Drive to Carmel/My Kafe and arrive at 12:30pm
Drive to Como at 2pm and arrive 3pm
Como-Torno boat ride
Funicolare Como-Brunate
Depart Lake Como 6:30pm
Return car at MXP 7:30pm
Depart 920pm.
Arrive DXB 625am and rent car
Check into hotel by 8am and drop off frozen food
Drive to Sheikh Zayed Mosque, arrive 9:30am
Depart 11am to Ferrari world, arrive 11:30am
Depart Ferrari world 2pm, arrive Ski Dubai 3pm
Depart Ski Dubai 4:30pm, arrive burj khalifa 5pm
Dubai fountain lake ride 7:45pm
If I did option B I'd probably give everything more time and try getting into Burj al Arab, though I don't care to spend a fortune to see it.