I have a 60" zero turn that is well past it's prime and is probably 30%+ of my justification for getting a compact.
I have a Simplicity CFC 18 (Commercial Front Cut) zero-turn with a 46" deck in addition to the
B2910 with 72" MMM ...
It's a mid-1980's unit with a 2-stage chain reduction drive (PITA to maintain) ... I just spent around $400 this past year to replace most of the sprockets and chains. Really wish it had the larger deck (60" or 66") ... hated to spend the money on something that old, but as 4570Man states it is very useful for trimming around trees. I wouldn't want to rely on just the
B2910/MMM alone. Plus we use it to haul a small (dump cart) and a watering rig.
I suppose I could continue to maintain that and get one for the 3 point on the
B3030 for the rest. I'd say there are probably 3-4 acres where I have trees to mow around, and another 6-7 without (some of which is pasture that I will hopefully turn to hay once the thistles are under control).
You'd be mowing about double the amount of acreage of what I am.
Assuming that you have other uses (projects) for the
B3030, and assuming you plan to mow on a regular basis (weekly ? bi-weekly ?), I think you'd find installing/removing the MMM
regularly to be a bit of a PITA. You can pin the MMM deck up ... but even that is a bit of a PITA ... and it will still reduce your ground clearance.
Personally, I'd look at getting a Quick Hitch for the 3PH ... which makes changing implements much easier.
I also wouldn't load the tires, if you plan on mowing with the
B3030 ... just stick an implement on the 3PH if you need a counter-weight for loader work.