Lawns generally benefit from light weight. The power is needed to spin the mower. Turf tires are going to be best.
Pulling stuff like plows through the dirt generally needs lots of traction and power, so weight and power are both needed to get the most from Ag tires.
You kind of need to strike a balance between the ways you will use the machine and how important each differing use is in your grand scheme. You may want to have 2 machines.
Personally, I look for a tractor that has a base weight around 1HP per every 100 lbs (minimum). Weight (balast) can be added if needed. Tire size can be adjusted for flotation to make even the heaviest tractors carry a light footprint.
I see a large difference between CUT's and SCUT's in weight vs HP. Is this important to a future owner. I plan on using tractor to cut lawn, loader work, back blade work to name a few.
Thanks
KC
For the type of work you're talking about, meaning the boxblade and loader work I'd definately go with a CUT. Probably with R4's
Andy