About 8 years ago I gave up my Snapper Comet 26" mower that I'd used on our place for almost 30 years. It wasn't worn out yet, but it took forever to mow our place if I did everything at once. But if I could get the mower to ride it down (brush, tall grass, saplings, etc.) it would cut it!
After trying several of my friend's and family's zero-turn mowers on my place, I bought the Cub Cadet zero-turn model with a steering wheel (the RZT-S series). I got the 46" deck to limit the spindles and blades to two, and to fit between some of the tight spaces on our place.
The deciding factor for this mower was that unlike other zero-turn mowers, the front wheels are active in steering and are synchronized with the rear pumps. Every other mower I tried had free-spin caster-type front wheels, and the mower was controlled solely by the two rear tires. Every one of those mowers broke loose at some point on the steep banks I have and put me into an uncontrolled slide to the bottom. No fun at all! And it was much worse if the grass was at all damp. My Cub Cadet RZT-S has never done that.
The trade-off is that it's not quite a true zero-turn. Where most will pivot in a small complete circle defined by the width of the two rear wheels because one wheel will turn in reverse with the other going forward if you ask it to, the best this style mower can do is lock one rear wheel while the other drives, so it pivots on the stationary rear wheel. It can turn 180 degrees into the next mowing swath just fine, but it can't turn back into the same pass you just made without some backing up.
For me, though, the stability on hills made all the difference in the world. And realistically it mows 5-6 times faster than the Snapper, due to the extra width, power, and maneuverability. But it does use a lot more fuel for the same acreage! All in all, if you have slopes to contend with, consider the RZT-S Cub Cadets. If you have a flat lawn, that gives you many more choices.
Good luck!