You may want to add a column to the spreadsheet for tractor weight, which I believe is a better comparison than HP - tractors are mobile power plants, and the ability to pull, lift, and push are controlled quite equally by their overall weight.
Or just which color you like.
On that note, Careful with the mahindras, I've seen a few around here that fade pretty fast when left outside that appear to be pink after a year or two...
Good luck!