We had a 9420 on 710's and went to a 9430T on 36" tracks and won't go back to tires. We were seeing a lot of wheel tracks after seeding with our 9420. With the 9430T the tracks are barely noticeable. We are in heavy clay soil and we seed through spots we'd never have seeded through with tires. I think it all depends on soil type and personal preference but we like our track machine and some will say they are terrible.