Best lawn mower for commercial use?

I like Snapper. They do make Snappers for commercial use. Straight forward with B &S engine. My other mower is a Yardman with a Tecumseh motor. I would stay away from the 2-stroke engines. Not economical either if you pay for all the 2-stroke oil.
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John Deere commercial ztrak. Look at their website and you will see several different styles that might have application for your special business. Like stand-up riding mowers. Deere also offers service on the mowers.

Get a ZTR mower. Some of the best are Scag, Bad Boy, Kabota, Exmark, Hustler, Ferris, Dixie Chopper, and John Deere.

I prefer 4 cycle engines for mowers. I have seen very long term service form Briggs and Stratton engines. After that pick the features that meet your needs.