I have a pretty normal width foot, but wear the same size it appears and MrBupp. Like he mentioned, I'd go with your TTS unless your foot is really wide. Originally I bought a .5 up (size 10) in the ADV 91-16 OGs and they work, but purchased a TTS 9.5 to compare and they feel better. .5 up will probably work, but you're more than likely going to have a little bit of slippage on the heel.
Long story short, go with your TTS unless you think you have a wide foot. This way you don't have to waste your time selling your extra pair like me now