All good recommendations.
But nothing in a zero turn tops a Scag in my opinion. For reliablity and for durability I truly believe Scag is the pacesetter . They are heavy duty commercial grass cutters all the way.
The decks are heavier duty , the frames are heavier duty, etc. My Scag Tiger is now working on 10 years of gobbling up a couple of acres of home lawn without a hiccup. I do change the oil, hit it with grease, clean its filter, and sharpen its blades all once a year. I did have a flat once too. I have seen my buddies go through all kinds of mowers in that time frame.
One thing is your local dealer and support though. If you get the best service and price through a dealer then go with that.
Case in point, at my wifes parents farm. They have John Deere. John Deere everything. Tractors, combines, boots, clothes, hats, tools, toys, cars, guns ... well maybe not those last two

... but their equipment is Deere.
They liked my Scag , but Deere brought them a zero turn out, left it and made them a great deal. When it needs something the Deere guys hop right on it for Grandma. So the Deere is right for them.