All three product models have a decent share in U.S  carpet cleaner market. Each model falls in different price category. So it very difficult to draw a decent comparison, but we will try our level best to bring whatever information possible, for you to consider.

Performance

There is not much of a difference between the three. We tested all three models with the same detergent and cleaned carpets with each model. There wasn’t a huge difference in performance and cleaning. All three models did an equally good job.  All are equally loud as well.

Cleaning

The Power Scrub and MaxExtract 60 have separate compartments for detergent and hot water. With SteamVac you will have to pre-mix them.  The cleaning ability of Power Scrub and MaxExtract 60 is well above SteamVac. There is a clear difference in cleaning ability as SteamVac falls behind the other two models in cleaning stubborn stains. However, SteamVac has a clean surge option to deal with stubborn stains. Power Scrub and MaxExtract 60 have an option to rinse the areas with plain water, which removes any remaining detergent solution on the carpet.  SteamVac tends to leave some detergent solution (only a bit) on the carpet.

Water Content After Cleaning

MaxExtract 60 does a far better job in drying the carpet after cleaning. SteamVac is the least performer of this category. Power Scrub does a better job than SteamVac but not as good as MaxExtract 60.

Detergent Use

Power Scrub and MaxExtract 60 use double the amount of detergent used by SteamVac, with maximum setting.

Dirty Water Removal

Power Scrub scores here as it has a plug option to pour out the dirty water. With MaxExtract 60 and SteamVac, you need to take off the lid to get rid of the dirty water. With Power Scrub, you will only need to take off the lid while rinsing the tank. It is a great advantage when cleaning a lot of carpets.

Upholstery

Here it is almost a three way tie with slight variations. None of them did a great job, all three models did an okay job, and ultimately they are called carpet cleaners, not upholstery cleaners.