Dwarves seem to have been a strong and popular choice in every edition of D&D I have played.
My usual party members think it's weird if I am not playing a Dragonborn. I have a lot of fun with them and apparently I am now perceived as one.
Cheers, from one Dragonborn fan to another. If I had a more central group I'd probably be in a similar boat, protesting, "I do play other things, honest, I just really want to play another Dragonborn!"
My albeit limited experience is slightly more nuanced than that. It seems like a regional thing, whether elf or dwarf is more popular--though a "region" can be as small as a single FLGS and its repeat customers. All told, the two remain common, but even in those editions where humans were seen as sub-par, humans were still chosen more often than not.