I rotate but that's only because I like carrying all of my guns at one point or another.
I do favor certain guns at certain times.
In the winter I'll carry my Glock 21 and XD 45acp, in warmer months my G-17 and G-26.
If im in a revolver state of mind my GP-100 357 Mag,
Somewhere in between my Springfield XDM 40 S&W.
I just enjoy carrying guns. I'd carry a Ruger Vaquero if I had one !