1. Kanto.
man this is probably nostalgia. R/B/Y was my first pokemon game and I loved it. The Gen 1 pokemon are still my favorites. I just liked exploring kanto
2. Hoenn.
you said it best bro
3. Unova
I really like the story in B/W B2/W2. and it has the PWT which was awesome. I liked facing all the champions
4. Johto
Johto was cool. I liked Silver and that champion theme is just so great. Fighting Red at the end was awesome
5. Sinnoh
6. Kalos
these two are just alright i guess.