Either the Dreamcast, Mega Drive II or PS3 launch model (some might say lunch model).

MS wanted as much change as possible from XB1, and it followed their trend of launching opposite colors from OG to slim with the 360. The 360 also launched with white and it did just fine. I'd guess the shorter duration of black OG 360's probably sold really well so they went with black as their main color for 360 slim, not to mention the glossy black with chrome accents design looked ballin on PS3 so why not on 360?

PS4 has followed a fairly strict rule this gen of "if it's not broke, don't fix it" and so the design and color of the hardware casings of all models has stayed quite similar with minor changes. This is most likely why they stuck with black as their main model color. PS wanted change with PS3 and so they did the same thing MS did this gen for the same reasons, except for that PS3 was already offered in 3 widely acceptable colors, so other than launching a pink PS3 Slim, it's not as easy to point out a color change with it.

Virtual Boy

The Switch of course. While a simple design, it has a tremendous look to it. The black, mat finish suit really well and the logo is sexy in itself. Very modern looking.

Gotta admit the 1X and PS4 take the cake in aesthetic appeal but they rightfully should. I never liked most of Nintendo's designs but the 3DS/2DS skus are an exception.

pc engine CD-rom unit interface

one of the first consoles to have a CD-Rom attachment and before Sega

later was redesigned and renamed as Core Grafx and even later Core Grafx-II

I like the look of the PSP and the Vita. It was very smooth and nice to look at.

PS2 Slim and Switch for how cute it looks.

The white versions of Xbox One S and PS4 slim and pro looked nice as well.

And the many 3DS Special editions! Such as the Pikachu and Monster Hunter versions!

Magnavox Odyssey

Nintendo Entertainment System

Those 2 have some of the best designs of any console ever.

* Ok i'm obviously trolling, though the NES controller was truly a great controller.

Seriously though i'm not sure which console i think looks the best, there are quite a few i like. PS Vita and Original Xbox are 2 consoles i think look great but i never actually owned either of them.  I also kinda like the Switch as well as the original PS4 model ( Both of which i have). The PS3 models except maybe the Super Slim look really good too ( I have the slim model but i really like the first model too). The Xbox 360 and N64 also looked nice and i really like the Gamecube too.  Oh and not to forget the Super Famicom (And PAL SNES too i guess.)

Unpopular opinion; though it's not one of my all time favourites I actually like the look of the Wii Mini, I think it's cute in a retro kinda way

Nintendo:
- Wii
- Gameboy Pocket
- GBA SP
- NDS Lite

Sony:
- PS2 Slim
- PS4 original
- PSP Go

Microsoft:
- Xbox 360 Super Slim
- Xbox One S