Well, it depends on what Gorons we're talking about. They've never had the same personalities in any title. In Ocarina of Time, they were fat, lazy bums who ate rocks all day. In Majora's Mask... hm, they weren't much different. In The Wind Waker, they were humble merchants. In Twilight Princess, they were hot-headed bruisers. And in Skyward Sword, they were enthusiastic archaeologists (especially Gorko).
The Gorons of Twilight Princess definitely rival the Zoras for me, although that's probably a biased answer due how cool the Zoras' design is. In terms of personality, TP and SS's Gorons definitely beat out the Zoras, especially in personality. For every other game, it's gotta be the Zoras.
So... 3 to 2, huh? Guess it's Zoras.