I draw a lot my self and honestly, most programs are just up to personal taste, I for one cannot stand to use Photoshop as a program to draw in, I do use it to do effects such as blurring or lighting stuff. Or quick fixes that would take long to do manual. The programs I do recommend are Pain Tool SAI, Clip Studio Paint or OpenCanvas, which is what I currently use my self.
I imagine you are using a drawing tablet otherwise Photoshop Illustrator is your best go.