Not at all criticizing your decision, but cops are NDing every platform they're currently carrying every day. And unless you're in a position to be reviewing or investigating such instances you're likely never going to hear about them. NDs with Classic line Sigs (P226s) were a 2 times a year thing for us.....as we're the 2-3 times a year NDs with personally owned Glocks.
ETA: "I don't like them" or "I prefer Glocks/CZs/M&Ps" are also both valid reasons to say no.