I'd say it's not easier than other software but the more rounded because Photoshop cater to different workfield, it's flexible when you know what to look for. So it takes longer to find your footing.
CSP have an extensive focus on comic so you have a lot features that help you with the process
Personally I use both. CSP for sketching and lineart because the feeling is way smoother than photoshop.
But then, I use the latter for painting mostly because I've been using it for so long but also because when I tried to switch, I didn't quite like the vibe of the painting in SAI or CSP.