It's a mix of Photoshop and Painter. In Photoshop I usually paint with standard round hard edge brush & use airbrush for smoothing. These days I also use some texture brushes... there are many of them in Photoshop so I use something that fits to the painting I'm doing. No special preferences.
In Painter I use camel hair brushes, chalk, digital watercolor, airbrush, palette knife, various blenders... something like that. The settings are default except the opacity and size. Basically you can play with any brushes until you find something that works for you.