Yes, most sound houses I have worked with use Protools.
But my biggest concern is support. If I rent a Final Cut or Avid and I have a problem the rental house is there to replace or fix the problem right away. I can’t be down for a week waiting for Sony tech support on the phone.
I heard that they were cutting some features at Sony using Vegas but don’t know if that is true. Does anyone know of any movies that were cut on Vegas?