It's been a while since I gandered the lineup at Lowe's. in my order of preference, these stood out as the best choices in my opinion:
1. I saw the Husqvarna model TS354D garden tractor that comes with a steel hood, not plastic, and a cast iron front axle, locking rear differential, and a 54" deck, plus a front mounted brush guard. Comes with a 25 HP Kohler. Cost is $3700. For $4300, you can get essentially the same mower with a 24 HP Kawasaki engine. The Kawasaki engine is nice, but I don't know if it is $600 nicer than the Kohler. Both come with a 3 year warranty.
2. The "best" John Deere that Lowe's offers is NOT a garden tractor, but a pretty good lawn tractor with a 24 HP John Deere branded ELS engine, 54" cut, It can be fitted with a front blade or snowblower and has a "heavy duty" transmission. It also has a really expensive plastic hood that is easily damaged and hard to fix. Cost is $3100. Comes with a 2 year warranty.
3. The best Craftsman is a $2600 lawn tractor that is has a 24 HP engine and a 54" mower deck. This is a tractor built to match a price point for folks on a budget. Comes with a 3 year warranty.
I can't guarantee that any of these will outlast the others, my crystal ball broke last week. And I was quite surprised that Lowe's doesn't carry the Cub Cadet line any more, and they don't carry Ariens line of lawn tractors either, just the zero turns.
No one has mentioned this, but go sit on the machines. How easy is it to get on and off. Check out the reach for controls, lift and lower the deck, how much belly room do you have between the seat back and the steering wheel. Is the seat adjustable? Will the seat be comfortable if you are sitting on it for say 2 hours? Will the seat hold its adjustment once in place? Will there be other operators on this machine? Someone much smaller, weaker like a 12 year old son or daughter? your spouse? Can they lift the mower deck? Will they be able to lift a front snowblower if you decide to get one in the future? I mention all the ergonomics because I'm a fat old fart that is 6'-3" and very right handed and what works for me may not work at all for a 150 pound 5'-8" left handed person. Are the lights bright enough to actually let you work after sundown? or are they purely decorative? How easy is it to check/change the oil, the air filter? Where will you be able to take it for repairs? On a dead flat lawn just cutting grass every week, with no snow removal, no tilling, no pulling an airator, You would be pretty safe with any of the basic lawn tractors with a 48" to 54" deck and have it last for years. Airating, tilling, snow removal all need a bigger stronger machine.