Well, fuel consumption, and the fact that you'll never need 27 hp. I'd stick with 20-22 hp at the most. If you 'don't do things that stress the drivetrain' most likely you don't need a huge engine, either.
Are you sure the overall engine dimensions are the same? I was under the impression that the 18-22 hp Command engines are the same physical size, while the larger engines have a larger block. Mounting interfaces and crank size may be the same, but the larger engine may not physically fit in the engine compartment.
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