Xeptu,
I always call "Changing to CTAF". It frees up a radio for activating PAL, updating weather and if CTAF gets to busy I'm not trying to listen to two frequencies at once. And when in or approaching a CTAF I would think CTAF would be the more important freq to listen to. If ATC have something improtant to say they will still try to contact me but at least they know why if I dont respond.
Makespeed250,
I use to say it but I don't think I've heard anyone say Niner in years, pilots or controllers. Guess you are right tho so I'll go back to saying it.
NF