I like both, though I've been playing 3-D ones more because after the SFII and MKII craze, the 3-D generation came with Tekken and Soul Calibur the two fighters I've played way more than the time I had spent with the old 2-d games. Super Smash Bros. Brawl was the first 2-D fighter I played since SFII and MKII. Wait, no I had borrowed someone's copy of MK Deception for about a month. That game was decent, but smash was the first since those two games that I've played a crazy amount of. SFIV has been the second since that time and now I guess I'm getting back into them, but nothing will beat my love for the ol' Tekken.