Wow, Gen 3 is winning? I thought people disliked that one.
Gen 3 takes the cake as my favorite. I've never played R/S/E ironicallly, but I grew up with Gen 3 games. My first was either Colosseum or Pokemon Channel, then I got Blue Rescue Team, then Pokemon Ranger then XD. So there's a little bit of nostalgia that makes me love Hoenn so much. But in these games, many other Pokemon than just Hoenn ones were available and I found myself liking a lot of Kanto and Johto designs. But Hoenn has the highest number of my favorite Pokemon designs and games, so I just love it the most <3
In order, I like: Hoenn, Johto, Kanto, Unova and Sinnoh.