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Something I've been working with on the side; Tank Girl sort of a character, entirely digital start to finish, I tried out Manga Studio for the inking, it's pretty cool.
I've only used manga studio for 'inking' so far, but it does have good sketching possibilities from what I've seen. You can work in progressive layers just like Photoshop.
I've only used sketchbook pro on my Ipad, it's fun but more like finger painting