Judging by shape and standard color, not limited edition and colors schemes..
Only including classic consoles that are or were commonly known. So no Virtual Boy or other consoles that were niche.
No further explanation needed, I think... List of best looking consoles are:
- Pc Engine Duo-R
- Mark III / SG-1000 II
- Sega Saturn, in particular the Japanese model 1
- 70's consoles with wood panels
- neo geo pocket
- Sega SG-1000
- Twin Famicom
- Pc engine core grafx
- Mega Drive 2
neo geo AES, 3DO, PC-FX and others that I have not seen enough of to evaluate.