Bruce
Ken is correct you need to determine what your core business is to be and them decide which is best for you and the customer. As you are only referring to commercial building work, I will also like to add is the location and building environment this also dictates what system you use, each commercial job has its idiosyncrasy also note that if you do any large builders cleaning or contact work during/after refurbishment 110v equipment is needed, also a method statement, ppe etc. is needed, plus your parking arrangements
Each method has plus and minuses this my not any sound sense to you but I have a tm/portables Ashby’s & Prochem (never a problem) and the generic bonnet system (this needs up dating) what works on one will not work on another.
Regarding training if you buy a new machine the manufacture gives the fundamentals to go further you will need the ncca
So pick your equipment very carefully it your money.
Len