Although I agree with the comments about these two machines and currently use a Ninja which I stripped and rebuilt achieving better vacuum power and I can still get a reasonable temperature at 50 feet, if I were starting out and had around £3000, I would look at the Prowler.
It's a bit more expensive, but it offers an awful lot of flexibility and the lack of a waste tank appeals to me, greatly.
If you can't stretch to Prowler, then you should try to see as many as possible, as you may prefer the feel of a Prochem, Altech,Extracta or other machine.
We are all built differently and there is a huge diversity in not only yhe way machines work, but in the tooling, some of which is extremely heavy and some you will take to, others you will hate.
good luck
robbie