Based on discussions with other folks who grow in my area (South Jersey), it seems like the vast majority of folks grow bells exclusively, and they seem to believe that everything else is hot and stupid. The folks who do grow hots seem to grow Reapers, unless they still think Ghosts are the world's hottest, in which case, they grow Ghosts. These are the discussions I have with neighbors, casual growers, etc...
Folks at the community garden tend to grow a lot of Bells but Anaheim/ Hatch types are popular there, too. Other serious gardeners who aren't necessarily serious chile heads seen to be into a mixed bag of things, but it seems like Fish Peppers are disproportionately popular with the long standing serious gardening types. I think because they look cool, taste pretty good, and aren't very hot.
But yeah, the most popular by far are Bells, around me. Next most popular seems to be Reapers, or so many folks claim, but I wonder how many are actually just growing red Habs from eBay, sold as Reapers...
I think that, as with most things, name recognition is a big deal. It seems like Bonnets got a big push on the Food Network last year, so maybe they'll get more popular with Normies soon, too. Personally, I've been tryna promote Fataliis around me, because they were stupidly productive for me late on 2017 and I couldn't possibly keep up with them by myself, so I shared a lot. Plus, they're a danged good chile... Hot enough to fascinate folks, but not hot enough to blast their faces off. I gave tons of those away and helped create some fanatics...
But nobody is going to claim that Fatalii is a household name these days. At least, not in NJ