It’s more about dealer support than brand. Any commercial mower is capable of delivering a great finished product as long as the operator knows how to use what they have. It’s the support from your dealer that will benefit you’re business far more than the name of equipment they carry. If the Deere dealer treats you great, stay with Deere products.
I have 2 dealers that treat me like gold. My Snapper Pro dealer and the Exmark dealer. I run Snapper Pro standers just cuz of the relationship with the dealer and the price tag(quality is good as well) and all my handhelds are through him as well(husqvarna). I bought my Kioti tractor and Z Spray through the Exmark dealer. Both of them take really good care of me. In fact I was about to pull the trigger on the 30” Exmark Aerator and had asked my Snapper Pro dealer if he could maybe become a dealer for Stinger. If he could do the warranty work or service I might need on the Stinger Aerator, I’d buy it. He called Stinger, they approved it so I bought the Stinger through him. The closest Stinger dealer was 250+ miles away, now it’s 4 miles. 1 good dealer is great but 2 good dealers is amazing.
I have a Deer dealer 2min. away. I dislike them so much that I drive an hour to the Gravely dealer. I honestly would be using deer today if the dealer didn't suck so much.