The thing is with brushes its like anything else its horses for courses .
If your doing residential all day every day then fine you can use a heavier brush
But if your doing a high rise commercial you wouldnt fancy using one of those .
that could be the other way round it depends on the jobs
I use gardiners myself because they are light sadly they don't last with heavy use maybe its because they are so light just been taken a step to far. I use them purely because I have a bad back as neck is lightness is great.
On higher commercial I prefer a heavier brush as it helps stay on the glass where with domestics that's not needed. But again that depends on the job.
It's user preference nothing more
Each brush has good pros and cons.