A consistent look is generally best. If you use prerenders, you should generally use them across the board. DKC gets a big point in its favor simply for using prerenders for nearly everything short of text. The same applies to Sonic 3D. I say generally because of exceptional things like the Special Stage dilemma. CD's Special Stages are somewhat hard to follow because they use extensive 2D scaling for pseudo-3D (a difficult science by itself), but also 2D scaling on hardware that isn't purpose-built for it like the Sega Super Scaler boards. Mania did the right thing by making the Special Stage entirely 3D.