Several threads here and general discussion and you may as well cruise by tractor by net . com and spend some time over there as well.
I just ordered some parts for a 10 year old walk behind low end exmark mower, 36 inch cut. Spent a hundred bucks in parts to get it a new fuel pump, tune up, air filter assembly, fuel lines and some related odds and ends. Other than tires I have not really done much other than change the oil here and there. Tires dry rotted.
Even though it is a low end exmark, metro branded, it is still heavy duty for my home use. And I have abused the heck out of it and it does not really seem to care. I thought I had a bearing going out, bent a nice big bolt instead. Replace bolt and no more vibration.
Yeah it is a walk behind and a small cut, but with the use it has given me it has sold me on low end commercial stuff for the most part. I can still be a cheapskate now and then, generally when something comes my way free or for a few bucks or for helping someone out.
Anyway, I figure you want to ride around. With a cup holder. No biggy. They make magnetic cup holders.
I compare the john deere stuff at home depot to being somewhat close to the push mower at wally world. They should work for several years and some people can get a decade or more out of em, some people can't get past warranty period by more than a day or two. If it can live inside, be cared for by someone who actually looks it over and cleans it up and gets junk off the deck and basically takes good care of his stuff it might do the job. It might not. But, this is new in your price range.
There is just about a collectors market for garden tractors, usually because they are worth the money. These get into the cost of what a decent used car can be so you need to look the thing over and see what you are getting into. On these it can be well worth replacing the engine if the engine is shot. I have dealt with some of the newer stuff, think it was a 20hp kohler in a cub cadet of some sort. Hydrostatic transmission never impressed me much, but I am an old fuddy duddy that way.
The garden tractor will have an actual braking system so if you want a little cart to fill with stuff this might be nice to have. Riding mowers generally don't have much of a braking system and if you have old belts that slip a bit and they use those for resistance in the system somehow you might find your brakes suck. I have had a lot of hand me down little old mowers and some were impressive. Some not so much.