Early years:
Toss up between a ZX81 or Jupiter Ace for the first computer around 1979, after numerous consoles like Atari VCS, Colecovision, Intellivision, Phillips g7000 (magnavox), and the infamous Grandstand. I quickly jumped to Spectrum 16k and 48k and 48k+, then C64, then speccy 128+2 and +3 editions. I think the Spectrum had the edge on C64 despite the monochrome graphics and terrible bleep sound... C64 often had clumsy chunky graphics that made many games shabby looking, but the best music of the period without a doubt. Fave games of the time.... Most of the games by Ultimate, such as Sabre wulf, underwurlde, Knightlore, Lazer Squad, Lords of Midnight, and of course the alltime great "ELITE" was the epic of the period for sure.
The 16bit era:
Jumped to Amiga A500 about 1987-88, then A500+, A1200 (which I modded with a 68030), also had an Atari STFM. Consoles I had around then were SNES and Megadrive. Game that made me jump to Amiga? ....F18 interceptor. Games I was into back then were arcade classics by Bitmap brothers like Speedball 1&2, Chaos engine, as well as stuff like Sensible Soccer, Stuntcar Racer, Midwinter, Carrier command, Elite, Populous, Dune 2 (The grand-daddy of the whole RTS genre), and many others.
The 32/64bit era:
Jumped to my first PC which was a Pentium-1 75mhz with around a week after UK launch with my first and last pre-built PC. Consoles were now bannished totally from my life, most of my mates had Dx33/66 rigs which i'd messed about with before getting a PC, the key title for the change to PC was UFO enemy unknown.... early favourites followed such as DOOM 1 & 2, Duke Nukem 3d, Populous 2, Freespace 1&2, Wing Commander series, and of course Command & Conquer, so I've never looked back. I basically spent the next decades upgrading every year or two, totally avoiding all things console until bought my daughter a Wii for her 3rd birthday last year (which is largely gathering dust since, and now she's turned 4, she prefers PC gaming...lol definately a girl with taste
).