Hi,
With the 50 amp service, you will not be thinking "DO I have to shut off the A/C unit so I can run the microwave?"
The microwave, coffee maker, toaster, A/C unit, and other things each draw about 13 amps. You can only run two on a 30 amp 120 volt service, limited to about 3,200 watts before risking shutting off the main breaker feeding the RV. The 50 amp 120/240 volt service can have well over 10,000 watt load and still not be at the maximum capacity.
So go with the 50 amp service.
In the winter, I like to have 2-3 electric portable heaters to help warm my RV. I have a 30 amp service, and have to manage them carefully, and plug one into a extension cord to keep my bedroom warm.
You will not need to 'manage' your power resources when plugged into a 50 amp service. Only when plugged into a 30 amp campground. Then you will have to set the thermostat warmer to shut off the compressor while using the microwave. Have to not make coffee, toast and use the microwave all at once!
Good luck, and have fun camping in your new unit!
Fred.
