Undoubtedly, Hal Jordan gets the most exposure and is seen as the 'main' Lanten, but personality wise, Hal's a bit of douche, and when he's not a douche he's being all mentally unstable, occasionally turning evil and what not. While Kyle has always been more laid back and cooler.
Plus I think his design's much cooler than Hals. Gotta love that freakin mask. What about my fellow viners, who prefers Kyle over Hal or Hal over Kyle?