I have a Husqvarna HST lawn tractor and a B2401 gear drive tractor with a brushhog.
The Husqvarna is great for getting in the tight spaces around the trees, going fast over the smooth lawn but being able to slow down easily for the bumpy bits and tight turns.
The B2401 is great for hacking down a whole fields with buckthorns, where you pick a gear and go in straight lines at that same speed for hours. I also mow some walking/skiing trails with it, but don't need nearly the turning radius that I do to mow my lawn, nor the fine control over my speed.
To run a MMM, rear mower, brushhog or a snow blower, you need the engine running at 2500 RPM - which means for any given gear, the tractor goes one speed. In "M" range, you can go 2, 3 or 5 mph. In "H" it's 4, 6 and 11 mph. Want to go 3.5 mph? Too bad, you can't. Want to change from 3 to 5 mph? Clutch and come to a
complete stop, shift, reduce engine speed and let the clutch out, increase engine back to 2500 RPM. In particular, operating a cheap, rear mounted snowblower you'd be limited to 1, 2.5 or 5.5 mph as there is only 1 R gear, for L, M and H range.
I did a short video this weekend on using the B2401 PTO, coincidentally with a brushhog, if you want to know what you'd be getting yourself into.
