Hey Max,
Even 20 years ago when I was just starting out on radar, a lot of time was spent teaching just how flexible turbo-props were on descent and close to the airfield. That teaching was reinforced by a flock of t-p drivers who wanted to prove a point by keeping their speeds up and eating up the jet ahead unless some pointed speed control was given.
As for this topic, I'll always opt for a clear speed. Whenever there's a chance for misinterpretation, it'll be done as per Murphy's Law.