Mt A is newly renovated and more carpark. Rooms are nice (my sis deliver there in March). Environment is nice. I think price slightly cheaper and more consistent.
My wife will deliver at TMC because of our gynae. TMC carpark is nightmare (I hate car lift) and only valet. Hosp feel cramped and crowded and service standards are questionable.
So if you're not tied to particular gynae, Mt A would be a simple and straight forward choice. My 2 cents.