Most all major brands of zero turns are a sum of their parts. They all use the same 3 engine manufactures, and either parker or hydrogear drive trains.
I would suggest a briggs vangaurd or kawasaki FX motor. And either parker pumps/wheel motors or a hydrogear 3400 or higher drive units.
Pick the best local dealer with a mower with the above specs and you won't go wrong. These would include toro, JD, kabota, hustler, wright, gravely, exmark, and grasshopper.
Compact tractors with lots of trees are terrible to mow with. A neighbor have over 70 trees was taking 7 hours to mow with their JD compact tractor with 72" deck. Their 60" deck grasshopper takes 2.75 hours.