This argument always makes me laugh.
I read some say they charge more for WFP as they've invested in some decent tools.
I read some say they charge more for trad as it takes longer.
In truth folks it's not the method but the operator that's to blame for bad work ...... with either method.
A well maintained wfp system, used properly, will do a great job, as will a mop and squeegee; but for my money the only times my bucket comes out of the van are for small shops, inside work and on balconies. Other than that it's wfp all the way.