Lydiard brought us distance training methods. Before him, they didn't exist in a coordinated way.
DON'T follow word-for-word his programs that are published in his books. The publisher made him put schedules in because that would help sell the books. He didn't want to do that.
Instead, follow his five core principles and look at the schedules for a general idea.
Coaching is art, science and "other".
Don't hire a coach solely based on their natural talent to run. A prospective coach can be dumb as a stump but may have talent and a great racing resume - who cares! Hire based on coaching knowledge and ability.
Human physiology hasn't changed in thousands of years or forever (depending on what evolutionary theory you subscribe to). And human physiology certainly hasn't changed since the late 1950s.
Keith Livingstone put out the best selling book Healthy Intelligent Training several years ago. It is the best modern interpretation of Lydiard training (written in today's language with heart rate info - there weren't hrms around in Lydiard's first couple of decades, so he never used them).
I was at a coaching conference a few years ago and bothe Coach Li of Arizona (Lawli Lalang's coach) and Salazar got up to speak one after the other. They both said, "I coach by the Lydiard method."
But their methods were polar opposites. One was intimate with every detail, was moderate high mileage, into a high level of quality for longer than Lydiard ever prescribed, the other was a low-ish volume advocate who wasn't sure how much his athlete was actually running in weekly volume. Two methods that couldn't look more different from each other and not like Lydiard either, on the surface.
Most people are actually not quite as familiar with Lydiard as they think they may be.
But regardless, I would choose Lydiard but would use Daniels formulas against "feeling-based" training (RPE) and HR.