1LQ CF bracelet on VSF 126610, here are my two cents when compared to my experience with 3VV and 1LQ VSF bracelets.
CF SEL mid step is taller and sharper than VSF, significantly more genlike. CF SEL recess profile is also better than VSF, VSF SEL flattens out as you travel ‘up’ the lug (towards the watch away from lug tip).
But SEL fitment on the CF bracelet is inferior to VSF, mine has side to side play while my VSF does not. There is also more play between the SEL male and first link on the CF than the VSF bracelet.
Clasp is built and finished better on the CF. VSF glidelock is significantly smoother with less play. CF fliplock locking action feels more solid and genlike but the fliplock itself moves freely while the VSF fliplock doesn’t.
Just like everything in the repworld - pick your poison. I’m sure there’s plenty of variation from bracelet to bracelet so YMMV too.