I think I would never use a tablet (it's both expensive and inconvenient for me) but I guess I'll have to study digital means of editing pictures, because I always manage to ruin a picture while inking and colouring
So I want to scan my sketches then clean my lineart and colour it. I don't know which one to choose - Photoshop, SAI or something else?

I need the most convenient and easiest one because I'm always short of time, so I can't afford experimenting and comparing them myself... You can see examples of my pictures, maybe that will be helpful.



Which one would you recommend? What kind of difficulties you had with those applications and what did you like about them?
Please spare a moment to help a beginner who needs your advice...