Really that’s a question only you can answer, if you are looking at a brand new machine, then I can highly recommend the Airflex range, produced by Cleansmart in Nottingham. There are other makes of course such as Prochem,, Altech. The beauty if the Airflex is it’s so flexible, with the option of different pressure pumps, twin or triple vac motors,,and they are very easy to work on. I have only been carpet cleaning since last summer, so only know what Airflex is like.