We often try to make do with tools we have under the sink even when we change our style. 
So, why does your stylist use a medium round brush instead of a paddle brush or Denman brush (what is a Denman Brush I think to myself)?
Simply put, to make their lives easier and your style last longer. Sure we can get similar looks using the same tool on all hair styles - it just takes a lot more work.  Take it from the pros - you don’t have to work so hard. Get the right tool for the job.