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As for the regions themselves, I really like Hoenn and Sinnoh. Actually, when picking my region for the Get-Together, I just went with the one I would most like to revisit, which after thinking about it I kinda surprised myself with Sinnoh. It really is a well designed region even though it's hell to get through on Diamond/Pearl because it is so slow.
As for my favorite region by Pokemon, I'd have to go with Unova or Kalos. Looking at my favorite Pokemon, a significant number come from Unova. Slightly less of my favorites are Kalos-native, but considering how few new Pokemon were introduced in Kalos, there seems to be proportionally more.
I'm not going to lie though, I sometimes surprise myself with my opinions on these topics. I feel like I used to champion for the Hoenn region a lot, and always fell back on Johto and Kanto because of how 'classic' they are. But while I like all of the regions and Pokemon from each, when being truly honest with myself I really like some of the newer Pokemon a lot more than the older ones. And region-wise, I only really don't like Kanto and Unova as much as the others. Kanto is kind of boring compared to the others, and Unova is just way too linear (or circular, I guess) for it to be interesting even though it does have some fantastic aspects.