What do those run?
Mine is a dino that was a commercial level one and was rebuilt by a machine shop guy I used to live near. Got it for $150. have had to do another $150 in work on it in the last three years, but it is a monster and doesn't need weight on it to do it's job.
No clue what a new one runs.
As for further diff, and Dobbs feel free to correct this if wrong, I was told by grass pad ppl that blue grass will spread where as fescue won't unless it goes to seed. So if you aerate and the seed gets dropped in the aerate hole, the grass plant will be too deep and won't spread to the surface if you are over seeding in fescue, which I do. The guy told me that it works just fine if bluegrass is your thing.
Verticutting opens up a trench to let the seed in without it being inches deep. Also, I have always had clay issues until last the new house and I was trying to open up as much surface area to get compost and fert in the as I could. I don't know if any of this is backed up by actual scientific knowledge, but it makes sense to me and it worked at my old lawn.