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I have Krita installed too, and I did use it from time to time.. It's quite similar too Photoshop. I like SketchBook pro, because it's more of a basic program. It's very simplistic and it feels like drawing on a paper.

I use Linux software, so I won't be giving SketchBook a spin.

That's ok. It comes down to a preference anyway. If Krita works for you, there is no point in changing it :) Eventually I will make a detailed guide of SketchBook, for people that might be interested to learn it. I know it inside and out hehe.

Absolutely, whatever tool works each individual.