I think the larger chassis will be a safer option for the long term project I have of converting 3 acres of woods into an orchard. I am favoring the TYM tractors because of the weight of their tractors. As in your comparison with your neighbors tractor, it seems that heavier a tractor is, the more work you get out of the tractor's motor. The tractor owners that have the heavier 20+ year old tractors tell me that 25hp will be plenty. The newer tractor owners of lighter tractors say that I should be looking at 40 hp tractors. The TYM 353HST seems to be the ideal combination of weight and hp.
As for mowing, I have no plans to mow the living space of my yard with the tractor I buy. I have a little rider that is well suited for the main yard and it's flower beds. I see myself mowing the orhard with a rear mount mower, but that area will probably be planted with clover for the deer.
I am located in Warren, PA. To give you an idea of my tractor needs, my property is 5 1/2 acre mostly wooded and flat lot with expansion plans if I can purchase my neighbor's 4 acre wooded lot for the ponds. I have 2/10 mile of dirt drive to plow and maintain. I would love to do lots of landscaping improvements to my lot like beds and gardens that would keep a tractor running just about every day off I get.
Any input on what I should be looking at in tractor options and attachments would be greatly appreciated.