We usually follow the latest stable kernel series by default.

Currently we use the latest LTS series (4.1) because this would break 
catalyst.

But in void there's really no need to hurry while switching between series 
because the linuxX.X pkgs
can be installed side-by-side with others. So that you can have all 
linuxX.X pkgs installed at the same
time. Just set your desired version in grub.