FWIW, I've been using 10's on my guitars for over 15 years now. I recently picked up a Music Man JP7 which was shipped with 9's. At first I couldn't wait to switch them out for 10's because I'd knock it out of tune while fretting just by the amount of pressure I'd put on the string. I also had issues where I'd slide up a fret but the fretted note would be out of tune because of the pressure from only sliding up the string. Also, if I could get the pitch to raise while hitting power chords in the lower positions, particularly on the seventh string.
Fast forward to 2 weeks later. I've actually gotten used to the 9's and have adjusted the amount of pressure my left hand exerts on the strings. I'm actually liking the 9's better now in that they are easier to control during vibrato and bending. They also seem a little more sensitive to harmonics and legato.
The only reason I would even consider going back to the 10's would be for more sustain and to eliminate the pitch changes while playing chords which I mentioned above.