Hello there! Sorry that I just now got around to this. I use two brushes,
One is the standard transparent watercolor tool that you get when first downloading clip studio paint/manga studio 5
This is the one I usually use for painting and more finished looking pieces.
The second one is a brush I downloaded from the asset store for clip studio called bv_bristle_1
I use this for pretty much everything else and use this for my askblogs.
I would say that it does affect my art in some ways. The watercolor makes it look more shiny and softer, but you have to be really steady handed with it. The other brush gives my art a nice rough look while being forgiving if you mess up linework or coloring in some areas.