+1 vote for the 122. I have a 70, 100, 122 (avatar), and a 169. My all-time favorite is the 122 with creeper. I'll assume this is your first one and offer MY opinion why.... The 100 is nice but tends to be used on easier cleaner jobs or when I want to pull kiddie carts around at engine shows. I've taken the mower decks off everything in favor of a 60" Exmark. When I want to haul loads of firewood or get down and dirty I use my 122 with three sets of OEM weights and ag tires. The 70/100 will stall if the load is too heavy using the same little yard trailer. The 122 is the first CC with a 12 hp engine and that keeps the family 70/100 purists at bay. I have since modified steering columns (3-turn upgrade), wide frame axle to allow 3/4" or 1" spindles (C-shaped), annual oil changes, Hy-Tran flush, and now working on an 1863 super steering upgrade. IMHO, if you can get only one, and based on years of personal experience, l'd compare each one for worn and beat up parts, fenders, creeper, sloppy steering and worn axle spindles, signs of incorrect or non-OEM replacements, dry rotted tired with rusty rims, and anything that doesn't look right. FB Marketplace is full of junk yard rebuilds where nothing matches, be careful. Look at signs of heavy trailer hauling where the ball hitch would go. Post photos if you're not sure, you'll get quick replies here. I spent years after my beat-up 122 purchase noticing things that looked off and then getting the correct parts so it didn't look like a 50-year old Frankenstein rebuild. Over time, you will notice. I could not have done anything without the support of this forum and the sponsors here. But if I were you, I'd get both.