I am constantly battling between using C and PBP. I absolutely love PBP. I can get my work done far faster than with C. I have had to use C in the recent past to create BLDC motor controller that PBP just couldn't handle. I am now working on a complex project that thankfully can be handled by PBP. This is only because I don't have to react too fast and the 18F Pic I am using has 128k program memory, of which I intend on using every bit.
RTOS and RAM sharing I think are the best advantages to C over PBP besides the higher level math capabilities of C. I would really like to see PBP offered with 16 bitability.