I have a 6ft rotary mower, also known as a bush hog, a 7ft side discharge finish mower with three blades, and a 5ft zero turn mower with three blades.
The rotary cutter is just for cutting the grass when it's a foot tall, or taller. It gets the job done, and from a distance, it's OK looking. It cuts the grass down to about four inches tall, give or take a bit. It's not a very even cut, but it's much nicer then nothing.
My finish mower does a very nice job of cutting my pastures. It will cut it down to 2 inches tall, and it's very flat and even. I can't go any lower with it becuause it's so wide and my fields are not flat enough to avoid scalping. I tried, but I kept hitting dirt, so I got it up to where I can go and not hit dirt. It's my favorite cutter. It's fast and easy to use. Unlike the rotary cutter, those four wheels do allot to keep it on the ground, and I never have to adjust it.
My zero turn is in another league. It's cutting the grass at an inch. It's a beautul cut that I really like. It goes where I can't get the tractor, and it turns on a dime. I use it for my front yard, my driveway and my entrance. If I'm having people over for a party or something, I'll run it around my lake a few times to get the grass really short for walking on. It's not as fast as the rear finish mower behind my tractor, and you have to mow once a week for it to be effective. It will cut taller grass, but there is a huge difference in the results if I miss a week.
I stop mowing over the winter months. Then in spring, I'm slow to get started in mowing. Mostly because it's not really needed, but also because I like to see the wildflowers bloom. My first cutting is usually with the rotary cutter. Then a week or a few weeks later, I'll start using the rear finish mower for the rest of the year, about once a month. The zero turn is used once a week, and takes about an hour to get done what I want done.
Both my rotary cutter and rear finish mower are Landpride. My zero turn is a Scag.
Eddie