Ahh, OutRun and AfterBurner II on the PC-Engine....
I have always prefered the PC-Engine versions of these games, over the MegaDrive-Genesis versions.
Even if (or assuming) the MD-Gen versions are technically superior in some or most areas, I feel that the PCE versions were made to "seem" more like the arcade versions. They're also more colorful.
I like the way the road in OutRun and the airstrip in AfterBurner II "scales" (software scaling) on the PC-Engine. Even though they are nowhere near the Super-Scaler powered arcade versions, they're pretty damn sweet on PCE.
Imagine if OutRun had been released for the SuperGrafx (it was listed as TBA in magazine ads)... Even more wild, imagine if the SuperGrafx had been a more powerful machine with true hardware sprite scaling like the MegaCD. I'm sure Sega would've allowed ports of their games to it, since they did to the PCE and other non-Sega systems.