what is the purpose for the 4 stall garage?
if it will be a utility shed, like on a farm. and you some time in future want to pull say a large camper. or have a boat, to larger size tractor, having the ^ peak end of the garage have 2 sliding doors. that open into a single entry way. can give you much more freedom when it comes to height.
i am not sure if i could live without 12 to 18 feet of clearance room. i tend to toss ropes around the rafters, and tie onto something and just lift things up into the air out of the way. and the tie other end of rope off to something.
it is rare but when i need the garage door clearance height, it makes for one large difference. and no need to worry about folding down a ROPS.
when it comes to the various shovels, rakes, brooms, etc... find that having a nice tall ceiling, lets me place hangers for the stuff up high and still easy to reach the handles. and then put small stuff below (tree shears, short handle shovel, etc..)
if you have a hunter in family, having ability to hang a deer up may make for a better higher ceiling.
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to above, are you needing a work shop area? or just a parking area?
a good shop with easy access, more likely will be used, and tools put back, vs having things cluttered across one or two long walls of the shed / garage.