I have had several zero turn mowers, small riding mowers, and compact tractors. I have seen both issues mentioned above. Belt alignment, and debris/grass damage. I have also seen the wrong belts installed cause it as well. There are several cross profile belts in use over the years. The commercial pulleys tend to be very broad with a shallow depth, while consumer machine pulleys tend to be narrow and deeper. You cant mount a pro belt on a consumer machine due to how wide it is, but you can install consumer grade belts on a pro machine which will shred them up pretty quick.
If you have your heart set on getting something new, I would suggest a subcompact tractor. A subcompact tractor can do a lot of jobs, while a zero turn is very limited. You can pull some implements with a zero turn but since they have such a tight turning radius you have to be super careful. Of course a subcompact tractor like a Massey cost as much as two or three zero turn machines. If all you do is cut a half acre of grass, and do nothing else, stick with the zero turn.
I purchased the subcompact tractor shown below at the end of 2015. It has been the most fun machine I have ever owned. In fact, I find myself inventing projects just so I can play on it.It looks like a toy, but it can lift over 1000 pounds and pull over 2000 pounds.It has 4 wheel drive and a diesel engine. Maintenance costs such as oil and filters are high, but do not have to be changed often.
View attachment 981171