Cap Ex as a Hard Number
I don't figure Cap Ex as a %. Add up the cost to replace everything over the next 30 years, then divide by 360 and add some padding. That is a safer way to figure Cap Ex.
Condos are probably going to be cheaper. As the HOA should take care of most of the external Cap Ex items. You are still going to have to replace:
Oven, Fridge, Dishwasher, Microwave 3x
Water heater(s) 2x
FOR SFH and MFH ADD
Siding 1x or Paint 2x
Your repair budget should take care of most of the dents and nicks that will accumulate.