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Hey Roberto – great question 🙂 sometimes when playing over dominant chords I prefer the sound of the natural 9 EVEN THOUGH there is a b9 in the chord. It just helps keep the sound clear in my head and to play cleaner ideas. I also prefer the sound of the pentatonic with no half steps in it because there is a good contrast when you switch to the Tritone sub of that pentatonic.
Thanks for asking!