CSP has good Assets that are free, which is something I love about it. I personally find the layout and organization of the whole thing to be confusing.
Also it’s, I guess you’d say “heavy”. As opposed to a light weight program. I really only use CSP for the Assets I’ve downloaded and immediately go back to PS. Upside is also that CSP can open and save PSD files. So that’s good for me. Because CSP lags too much for my liking.
As I understand it, CSP has better tools for lineart and illustration stuff, but I find them complicated. Then again I do traditional lineart, not digital, and I don’t use a tablet so I can’t compare those. Overall I prefer PS. But CSP does have a trial version so I suggest that.
But you can always use both too