I had a browse through this thread, and am pretty sure that I know my answer, but thought I’d get your perspective:
I’m setting up characters for a cell-shaded animation. I am also referring to the book ‘Stop Staring’. Osipa heavily promotes blend shapes/morph targets/additive deformation. I feel the two big reasons are to preserve volume and speed the animation process through key sets, especially for lip sync and face acting.
More natural, to me, is a joint-based rig. I found some useful information from the Last of Us team who used a combination approach, primarily joints with morph target correctives for conservation of volume.
Of course, in the end, it’s whatever looks good and works well for the animators. And so far, joints are doing that for me. I imagine that the greatest control is sculpting the essential areas for brow creases, nasolabial fold, etc. But for something simple, quick and easy it seems that joints are the way to go.
Any other thoughts on an approach?