Problem with machines, is, we all have our favourites which may not truly reflect the suitability for another individual.
I've been fascinated by the Cross American ( rebadged Scorpion for the UK ) for years, based on it's power..............but power, as we know, isn't everything, as the CFR debate has shown.
If I were starting out in this business, I'd find it EXTREMELY difficult to choose.
The Prowler would be at the top of my list...................
The CFR workstation would be up there too................
The Ninja also, this is what I've used most and still do...
but I would make sure that I saw the others, particularly, when you consider the outlay.
Then, of course, there are other methods, which, along with the correct chemicals, may be better for your particular, target market !!!!!!!!!!!!!!!!
rob