Here are some key differences between them that you may want to know before making a purchasing decision.
(The models we will compare are Hoover Floormate SpinScrub FH40010B/FH40010 and Deluxe FH40160PC/FH40160)
FH40010B vs FH40010 ==> same machine, B stands for Bonus, FH40010B comes with bonus Hard Floor Wipes that are good for spot cleaning
FH40160PC vs FH40160 ==> same machine, PC means Plain Carton

Floormate Deluxe vs SpinScrub
images from manufacturer

Cleaning Modes
This is one of the apparent differences. The SpinScrub has 3 modes to select from – Vacuum, wash, and dry, whereas the Deluxe cuts the Vacuum Feature, only wash and dry modes.
The Vacuum mode is for dry debris pickup.

Handle Design
The SpinScrub has a foldable handle for simple storage whereas the Deluxe has a fixed handle that cannot be folded.

Tank
1, Location
The SpinScrub tanks are located at the front whereas the Deluxe tanks, taller and thinner, are positioned at sides.
2, Capacity
The Deluxe has a larger tank capacity that is 1.5 quarts versus 1 quarts on the SpinScrub.

Weight
The Deluxe is over 2 pounds lighter, it weighs 13.8 pounds whereas the SpinScrub has a weight of 16.5 pounds.

Cord length
The SpinScrub has a 7 feet longer cable that is 27 feet versus 20 feet on the Deluxe.

Nozzle
The SpinScrub has a Nozzle Width of 13 inch versus 11.5 inch on the Deluxe.
The SpinScrub has 6 scrubbers whereas the Deluxe has 4 scrubbers.
Wider nozzle means you can clean your floors with less time whereas smaller nozzle allows you to use it to clean tighter areas.

Cleaner Brush
The SpinScrub has one brush whereas the Deluxe comes with 2 brushes – a Wood Floor Brush and a stiffer Tile & Grout Brush.

Warranty
The SpinScrub carries a 1 year limited warranty whereas the Deluxe is backed by 2 year warranty.

Clean Boost Trigger
The Deluxe has a Clean Boost Control at the handle that allow you to apply extra detergent on those tough stains and heavy traffic areas.
Whereas the SpinScrub does not have this trigger.

Motor
The SpinScrub has a 6 amps motor whereas the Deluxe has a 3.5 amps motor.

Handle Release Pedal
The pedals are located at the back, the one on the Deluxe is at the mid whereas the one on the SpinScrub is located at the left side and is smaller.

If you own these 2 Hoover hard floor cleaners, please share your experience, add more comparison info to help people buy the better one.

The Hoover Floormate Deluxe FH40160 and FH40160PC are the same, the “PC” stands for “Plain Carton”.
Hoover Floormate FH40150 vs FH40160PC
images from manufacturer

The difference between Floormate FH40150 and Floormate Deluxe FH40160 are as follows.

1, The FH40150 comes with only 1 brush – SpinScrub Multi-Floor Brush (assembled in unit) whereas the Deluxe FH40160 series include 2 brushes – a SpinScrub Wood Floor Brush (assembled in unit) and a SpinScrub Tile & Grout Brush. Brushes for wood floor is softer than the tile brushes.
The FH40163 comes with a SpinScrub Multi-Floor Brush.
(Included brush may change, please make sure what are included before buying.)

2, The Deluxe FH40160 series have 2X tank capacity.
The FH40150 has 0.75 quarts clean water capacity and 0.75 quarts dirty water capacity whereas the Deluxe FH40160 series and Professional series FH40163 have 1.5 quarts clean water capacity and 1.5 quarts dirty water capacity.

3, Color Scheme.
The FH40150 primary colors are blue and silver whereas the Deluxe FH40160 series and professional series are silver.

4, Cord Length
The FH40150 has a 20-foot cord, the Deluxe FH40160 series have a 20-foot cord whereas the Professional FH40163 has a 25-foot cord.

5, Performance
According to user reviews, the Hoover FH40163 Professional Series Deluxe sprays more cleaning mix for better scrubbing and extracts better.

Other than that, they are functionally the same.
They both have wash/dry mode selection, 2 tanks – one for clean water and one for dirty water, 3.5 amps motor, no edge cleaning brush, removable 11.5″ nozzle and brushes, weighs under 14 pounds, come with 16 oz Multi-Floor Plus 2X cleaning detergent, and backed by 2 year limited warranty.

You can learn more details by downloading manual from hoover.com, here is the page link to hoover product manual:
https://hoover.com/pages/product-manuals