One thing that bugs me every time I see it is when people say that the PCE has two 16-bit graphics chips. What's even more irritating than that is when other people say that the 16 is just the addition of two 8-bit graphics chips. Both are incorrect as all hell. First of all, you have to actually know what you're talking about...these people are referring to the
PPU, or
picture processing unit, a term given to a circuit or collection of circuits responsible for outputting the display. When people talk about two chips in the PCE, they're virtually always saying it in a way that implies that the PCE is putting out two graphics displays...as in two PPUs. But anyone who's done their homework on the PCE's architecture knows that the two graphical workhorses in the PCE work in unison on different aspects of the display...one is responsible for the actual bitmapped data among other things (the VDC: Video Display Controller), and the other is responsible for the color data (the VCE: Video Color Encoder). The combination of these two chips forms the singular PPU inside the PCE...an efficient two-chip circuit collective.
The SuperGrafx though, as we all know, DOES in fact have two video controllers, so saying that IT has two 16-bit graphics chips inside it is technically correct.
As for the meat of the thread though...it really depends on what angle you look at the subject from. Are you a gamer or a developer? If you're a gamer, what kind of games do you like? Your view of the consoles will change depending on your tastes. If you're a developer, what aspect of development do you work with? If you're an artist, the PCE is going to give you an excellent choice of color usage that rivals the SNES only in overall freedom of design (the tradeoff between total palettes and color element range). If you're a programmer, what's your hardware familiarity? Old-school coders will have no problems adapting to the PCE or the SNES, since both are based in the 6502 processor, but the Megadrive used the less familiar 68k. How about a sound coder? You're best off on the SNES if you're doing sound effects, and on the PCE or Megadrive if you're doing music for CDROM-based games...obviously, the SNES' SPC700 sound processor has technical advantages over both its rivals for cart-based music though. As I have developed for all three consoles, I can speak on the development subject with experience behind it.