The W1 has vastly different programming, way different options etc but that should be obvious.
W1 cycle times are a bit longer over all, even for the US market.
The W1 drum is physically smaller, but rated the same capacity, yes.
The W48xx series wanted fast cycle times and thus wanted to ensure load was wetted quickly.
That's why you aren't supposed to stuff them.
The W1 you can stuff to the brim. The new drum is amazing at moving water around.
If you get a PowerWash equipped model even better - the recirculation helps of course.
I can wash my EU pillow (80cm * 80cm) no problem in my W1.
As long as it fits it washes usually.
I guess your cleaning business means a lot of rags, towels, mops. These aren't an issue no matter the load size.
If you want the higher drum volume you'd have to go professional.
Since you have a business you should be abled to get the equipment.
Drum volume wise, an OctoPlus machine would be equivalent to the W48xx.
BUT you can stuff these machines anyway.
They do need high voltage and large breakers though.
The LittleGiants are basically the W1s on steroids.
They need high voltage too, have slightly bigger drums, shorter cycles and a lot of speciality cycles.
However, if service is an issue in your area, and SQ is better in that regard, i wouldn't push that option out either.