Pyramix is my choice
I bought it about 8 years ago when it was demonstrated to me by my local supplier in L.A. I work for a large post house where we use PT & Sonic; and I record at home using Pyramix. PT is popular because it is ubiquitous (VHS vs Beta, etc.) and Sonic for its NoNoise restoration algorithms and capabilities. In my opinion, Pyramix beats them both, hands down. Other programs record at 192/24bit. Pyramix at 384/32bit and higher. Pyramix will import and export PT, Sonic and other sessions, and has the most file exchange formats I've seen. It is possible to configure the Pyramix keyboard to follow PT, Sonic and other programs' keystrokes. But if you take the time to learn Pyramix's own commands (more flexible = more complicated), editing is MUCH quicker. I've used PT, Sonic and Pyramix extensively and it is my choice to own. The company is Merging Technologies and their site is merging.com. Check it out for yourself.