I'm a 20+ year dvorak user, but if I was starting over again I'd probably go colemak.
If I have to use a computer for more than a few minutes, I know I can easily switch it to Dvorak without having to install some drivers which if it's not my computer would be a big no-no.
This was the deciding factor. I have even developed my own keyboard layouts for assignments using genetic programming and I have a pet project using a chorded keyboard, but I wanted to have something relatively standard and well known and likely to be supported by keycap manufacturers. I'm sure there are better layouts, but Dvorak being a well-known standard trumps most of them.
PS- just got notification that my Moonlander Mk1 shipped today!