I'm in the market for a 45' to 55' sport fisher and wondering about the pluses and minuses for these motors.
Engine model numbers would help. All have good engines, all have bad engines? Some even have great engines but to answer your question, need engine model numbers to discus them better. Then you need a good/great shop to support you.
How long is a piece of string? Without knowing year/model/hours and the boat itself, it's an impossible question to answer. Overall I'd choose common rail Man's, cat's and DD would be a very distant third.