The Steiners and Ventacs are more expensive but more capable for many tasks. Steiner has a dealer network that is pretty well established, Ventrac is working on their network. As of now, I have bids on both brands.
A Ventrac 3000 with a 52" deck is about $9250, add $300 for a 60" deck. A Steiner 415 is about the same price as a Ventac 3000. A Ventrac 4100 series with 60" deck is roughly $13,000.
Dealers for these 2 brands are willing to drive a long way to take care of their customers, I have demo units being brought to my house from about 200 miles away (free of charge). The tractors are probably not suited as direct comparisions for people looking at a standard garden tractor for simple mowing tasks, but for people with hills, or for people with real gardens that will require real work, or for any heavy duty operation, both brands seem to be made as tough as military tanks and will go just about anywere a tank will go, and they are not going to tip over like a garden tractor or CUT would be prone to do. Both brands are probably better compared to the compact and sub-compact diesel tractors rather than to garden tractors. I think that because of their special capabilities a simple price comparison will always have discount shoppers simply go to Deere or Cub. But price comparisions are what they are, when features are compared, these things have few real competitors. As for people who don't need some of the specialized features (hill holding) then I think people often totally miss out on the Power Trac equipment, and that is a total shame because their smaller units are very competitive to Deere & Cub, but will do 10 times the work, easier and faster. Again, people who want a lawn tractor probably should not consider Power Trac, any more than they should consider Steiner or Ventrac. The PT machines are actually designed to do work, and they will also mow your lawn. The Steiner & Ventrac are designed for some unusual conditions and commercial applications where rough service is normal, and they are primarily mowing machines in those applications but they are capable of other tasks as well.
I would think that for anyone with a suburban lawn, then the JD or Cub is their prime choice because they THINK it is the best. They are both very good. But if you are going to ask a bit more of your garden tractor, there there are better units to be had. And from what I can see now (and I admit to being newly educated to this) the tractors that are better appear to be so much better that it is silly to compare them to JD or Cub garden tractors.
So for the suburban lawn, buy a Cub or JD. I think Cub might be better because I have seen in my neighborhood that the Cubs take rough use better/longer. Someone else may have different experience.