Though I would probably say my favorites for exclusives would be 1st the SNES, 2nd Mega Drive and very VERY close 3rd the PCE.
Blasphemer
But it ranked very high conidering you have absolute no nostalgic feelings for it. So I would assume, that PCE would be your absolute #1 if you had it back in time.
I'm actually someone who has no nostalgia toward any of the 3. I *get ready for this* skipped out on the 16-bit gen. I owned only a NES until the 32/64-bit gen, and only played mostly Genesis and some SNES at friend's places. I finally got a SNES when I was 15 by trading a friend for my PSOne, a Genesis was given to me on my 17th birthday by my now sister-in-law, and I've only owned a PC Engine Duo for about a year and a half.
For me personally, I actually like the PC Engine the most. I also have to admit a lot of the reason for it being my favourite is how much more interesting the console is itself. All the hardware variations, the HuCard format, the great CD sound and cutscenes. How can you not be a fan of the console?