Well, Inkscape is a vector graphics program, not a raster program like GIMP or Photoshop, which means it has a very different focus. You can't really do complicated image editing or painting in a vector program (beyond simple things like that rescaling or just drawing over the source image, unless you're both clever and crazy,) but vector programs are well-suited to making clean, flat, cartoon images like this show's style.
Which is better depends on what you want to use them for. I've been trying to develop a way to do smooth shading on vector art in Inkscape (involves a lot of Gaussian blurs and a lot of clipping!) but it's really probably a bad idea for me to even try that for anything remotely complicated. So I've been trying to improve my raster skills in Krita, (which I switched to after I ran into one too many annoyances whose official fixes were "oh you can't change that" with GIMP.)
But don't take my word for it, listen to somebody who's actually any good, which isn't me!