In what aspects? Even the genny had just very few more details (beach f.e.) plus FM music (even relatively sorry one), it still played and felt much choppier than the pce port.
PCE Outrun also used more original sprites and tiles from the arcade. as for the the genny port basically everything was re-drawn.
...
After Burner II proved even more how the PCE could handle the job significantly better. And that isnt't even considered as 16-bit by most of the peeps..lol.
Regarding Outrun, the PCE version just doesn't feel like it's trying hard enough as opposed to, say, After Burner. The forks in the road are pretty flickery & harken back to the SMS version, and sometimes glitch out completely. One time I was playing & got just a little too close to the middle of the fork, and the game glitched & my time ran out because I couldn't get back to the track. And you're telling me the graphics were pulled from the arcade? Maybe so, but the resolution is terrible for it. I mean, the ferrari logo on the back of the car is made out of, what, 9 pixels? And some of the objects, namely the rows of flowers/grass and clouds, seem to have been amputated slightly, like the PC Engine couldn't handle the whole sprite or something (which I'm pretty sure it could have...right?) The canyons look mostly atrocious, but that's to be expected. Also, why is it that when you crash, the driver & his bimbo don't come tumbling out of the car? Hardware limitation or programmer laziness? Also, no voice synthesis. Even Space Harrier had that, however unintelligible it may have been.
I'm not saying I hate it, and from a hardware standpoint, it's mostly on-par with the Genesis version. It just doesn't feel like it has the same amount of effort put into it as After Burner (as can be seen with the fake scaling on the aircraft carrier & refueling plane, and the good sense of speed) or even Thunder Blade (the only console version of the game with layered tile buildings). Outrun PCE is great and all, but it could have been better, and it should have been.