I have no idea and no opinion on which is better etc, just genuinely curious.
I guess it's possible that at some point the major interface methods will be standardized to such a degree that future changes will be aesthetic, to avoid putting off people, if nothing else. For instance, there was considerable resistance to MS changing the functional interface of Office not too long ago. But even mature consumer interfaces such as windowing systems continue to introduce additional functionality, although I guess some might characterize those changes as mere window dressing (heh), as well.
Some computer interfaces do head towards what some conceive to be the true answer, with a slow stream of incremental improvements, e.g. the Unix shell. But that's a professional interface subject to other kinds of pressures than consumer technology.
IANAD.
Hard creases are very in right now, as are sweeping contours (90s) -- today's style looks like 80s + 90s + modern facelifting.