I’ve been storm chasing for nearly 20 years and I’ve chased a lot of places across the country! For this completely biased, unscientific, but personally preferred list — I chose the three places I have tended to see more storms that produce tornadoes + good storm structure. I tend to lean more into tornadoes than I do storm structure as something I am after (though I will never complain about interesting storm structure!). So my list is biased towards that!
My three favorite places are all on the central/southern Plains, and I honestly took some liberties to create some pretty big regions. And when limiting your favorites to three, you tend to leave out some pretty popular places (Montana? N KS/S NE? DAKOTAS? CANNAAADAAAA?) — so feel free to tell me why I’m wrong for not including any of those in the comments!