That's cool that they approved LPX and you'll be able to use that as a standard between projects.
I'm in the other camp that has to use PT because of two reasons:
1) it is what 90% of the projects are sent to me are in. Which is fine. Sometimes I pull them into LPX anyway if I don't see any need to stay in PT.
...but,
2) If there is going to be any heavy automation, I absolutely have to use PT12 because the automation in LPX is - to me - just unusable if there are any plugins in the mix which introduce latency (and that means basically any plugins, especially UAD or Waves). I am fine with basic automation, like pulling down the volume of a verse or chorus, but if I have to automate around "de-essing", pulling down specific transients, or automate send/aux's, I don't have to time to guess and then listen, guess and then listen some more, to find exactly the right place to input some automation. If I can *see* the transient, then I need to be able to automate around it and keep moving... instead, in LPX, I have to automate around it, then listen and find out how far off the automation was written, then highlight it and move it and check again to see if it's ok... rinse/repeat until that one section is correct.
I will probably always prefer to work in Logic - it has been my main DAW for almost 15 years - but that automation bug has planted me squarely in Pro Tools land until it gets fixed. Bummer.