Same, all 3 races were fun though. I used to play against friends but large skirmish battles against multiple computer AI were also really fun as well as custom maps on Battle.net like marine line defence.
Every 5 years or so i install the game again to relive the former glory and have to play a few rounds with all 3, Terran, Zerg & Protoss.
Terran, because you can bunker down with Vulture Mines, Siege Tanks, AA Missile Turrets/Gladiators & of course, Bunkers. As nothing can penetrate your defence then you have plenty of time to develop your multiple Nuclear Missiles and send Ghosts in to launch them on the enemy - great fun!
Protoss, because you can build a massive defence of Pylons & Cannons that is also virtually impenetrable if done correctly and then recruit a huge number of Carriers that can float around the map destroying whole enemy bases in no time at all.
Zerg, all about the fast build/recruit times, building a high number of Hatchery's very quickly and rushing the enemy, the Creep Colony buildings and Lurkers are also nice.
Great game, funnily enough I've never bothered to try SC2.