Wayne
I have not had personal experience of either machine, except for a couple minutes at an exhibition of a bit of wanding with the Airflex - which doesnt count as having a proper go.
Do as our friend in Perth says - get a proper demo of each, and maybe the other machines on the market ie Scorpion and Alltec triple vac, and take it from there.
The Texatherm machine works on a different principle to the others, so you need proper evaluation of all. When I say proper, I mean a proper job in a house or commercial, typically a type of job that you would normally do.
I have bought a machine in the past from Texatherm and from Cleansmart and I find their service and backup really good.