Just for the record, the Hydro has the jets at 30º angle, the GH is at a 45º angle, On a nasty apt. it is possible the Hydro would leave a cleaner looking apt. grade carpet, I won't go into the whys of that, just leave it at that.
If you wanted to get more impact and agitation, you would have to turn the GH pressure up, it has high flow, low impact jets, a 95 degree jet hits harder than a 110 deg jet. I'll bet I know which one was drier, and which one was cleaning more Sq. Ft. per hour. TUrn the pressure up on nasties, and report back Joe.