I've done OEM, GMK, SA, and DSA caps thus far.
Adapting between them never felt tremendously hard. The most noticeable difference, though, is definitely SA. I found myself missing a few letters at first given the height change. However, once that adjustment period was over, they wasn't really much in the way of noticeable difference in terms of typing other than occasionally noticing I'm typing on spherical caps instead of the cylindrical caps I've normally used.
Right now, though, I'm on GMK caps with the Skeletor colorway that I rather enjoy. With another board on the way and possibly another ordered somewhere next year, I'll have homes for Dasher and Dancer as well, both SA sets.