Having to choose one is a bit tough, but I'll have to go with the Amiga. It was a great computer. I had 2 of them over a span of about 10 years, with the second being heavily modified over time.
I almost picked the Commodore 64, as it was my first PC, but the Amiga was huge leaps ahead of it. However, I did really like, and often miss, the fact that I knew almost *everything* about that computer. Basic and Machine Language were easy to learn because the instruction sets were small, and I knew what every memory location did, and how I could use them. I was never quite that familiar with the Amiga, and since Windows Xp, I barely know what's going on at low level in my computer...
Anyway, I don't like lumping PCs with consoles, so my favorite console was SNES. It had some really great games for it's time. I still play some of them occasionally.