Best Region Thus Far?

Okay, so we've seen six different regions: Kanto, Johto, Hoenn, Sinnoh, Unova, and Kalos. Here's the question: Which was best and why?

One word, graphics.

Johto because I liked the historical mystique the region was famous for. In contrast, Kanto felt more like a simple collection of routes and cities, while Hoenn was a collection of natural landmarks. I liked Sinnoh and Kalos too though, because they felt more fleshed-out, but after 3rd gen, it was harder to suspend my disbelief once I stumbled upon certain ruins that housed certain legendary Pokémon that there were only supposed to be one of since they were legendary and all...

My favorites in order:
Johto
Kalos
Sinnoh
Kanto
Unova
Hoenn

My favorite is Kalos because of graphics.

My least favorite is Hoenn because I spent the least time there.

My favorites in order

Kalos
Unova
Kanto
Johto
Sinnoh
Hoenn

I like Sinnoh, but I don't like exploring Sinnoh as Dawn or Lucas, these are my least favorite trainers to play as.