I’ve used both — the 90T is slimmer and easier in tight spots, but the 120XP has that super smooth 3° swing which is great for precision. I’d lean 120XP unless you’re often working in really cramped spaces.
For that tractor bucket repair, a plasma cutter will make cleaner, faster cuts on the 12 ga steel and save a lot of grinding. Oxy-acetylene is still handy for heating and brazing down the road, but if it’s mostly cutting panels right now, plasma sounds like the better investment.
Glad you got it off! Those push nuts can be brutal once they’re mangled. Axle collars sound like a solid long-term fix—way easier to deal with if you ever have to replace the wheels again.
I’ve had the same issue before. I usually use a small flat-head screwdriver to gently pry the push nut while twisting it slightly. A little penetrating oil can also help loosen stubborn ones.