punch line:
as we all know, all of the 3 systems had its weakness an strength! the SFC came up with beautiful colors and nice and smooth chip tunez but lacked a lot in speed and dynamic issues. the Mega drive in contrary was a much faster machine which was predestined for hardcore action games with raspy and brassy tunez but mostly show up a low palette in game grafx.
the PCE was the perfect mixture of both. with higher color on screen than the MD and also equal in velocity, the PCE could compete easily both of the system in almost all the genres available. and all the later cd-media and all the other adds strengthed up the system beyond anything.
although each of the system has its own unique titles which makes them all more than worth to own and praising.
a sapphire is only possible on the PCE, due to its arcade add on and tons of possible gadgetry!
an alien soldier may be is only pissible on the MD, since the action is overloaded to its max!
an axelay with all its beatiful BGs and technical gadgetry only on the SFC!
and now PLZ back to on-topic, you guys 
Speaking of getting back on-topic, I think that Sapphire could been done reasonably well on both systems. They wouldn't be pixel for pixel perfect copies, but would be similar enough to be considered decent ports. Of course, I consider the Sega-CD port of Lords Of Thunder a success and not a reason to vommit, so take that into consideration.
One genre I think the Pc engine cannot complete with the other systems is driving games.
This thread was originally a want list of dream ports for the PC Engine and has been hijacked by "can the PCE even handle any ports at all?".
But as for real actual games that exist, it all depends on the
type of driving games you're refering to.
I don't know if the PC Engine "cannot complete" with MD & SFC in Racing RPG's, Top-Down Racers, Super Sprint/single-screen Racers.
But if you're refering to behind the car, driving into the screen, arcade racers, the PC Engine still has a lot of them(
maybe more than either the MD or SFC do), but none are fully polygonal or anything.
I haven't played many, but I imagine that of the ones which don't have mind blowng graphics, several must still have some decent gameplay and are fun.
