Short answer: SBP suites better.
Long answer:
My first approach with a sketching software was like 5 years ago with Photoshop, really powerful tool but took me some time to set up all the brushes and learning to use them properly. In fact I had to sell my Wacom at that time so never got the chance to real dive in photoshop sketching. Then sketchbook came out with the Designer version and the Pro version, anyone remembers? At that time seemed a nice soft but needed some more development. A few months ago finally got able to buy a Wacom again and SBP suites better for me and my workflow. Never tried Procreate neither had an iPad so…