Charles depends a lot on where you are operating and what you need.
The Pro-96/2096 series of radio's is excellent and proven and has a very good track record on the states DTRS system.
The PSR-500/600 series is a newer more full featured model but still works well on the DTRS system with the distinct advantage of being able to monitor 700MHz DTRS sites as as Thorton, Ft Lupton, Kiowa and rumor has it some of the new Pueblo County sites when they come on-line.
Another major advantage of the 500/600 radios is there ability to monitor and decode esk.
For me the bottom line is the Pro-96/2096 is the work horse and I have seven, excellent proven DTRS radios but I also have three 500/600 radios for the 700MHz sites on DTRS and for Denver in the future but I feel strongly they are more confusing radios for not only programming but also for monitoring and logging.
Personal opinion only, your results may vary.
Would you like to borrow a programmed PSR-500 to put it through your own trials?
Jim<