I dont think Horner is a strategist... he seems to be a good manager and politician. Newey is most likely better on the strategy side, it seems when he is there - Red Bull do much better... when he stepped away they really struggled. he is one of the last designers / engineers / team managers left from the late 80's and early 90's when you did it all on your own. I think it does count to understand what the car is doing - how it uses its tires, and then build on the go strategy from that. Ferrari sadly lacks all that expertise.
My wife had the pleasure to give Will Buxton and his wife and private tour of where she works at SUMMIT One Vanderbilt in New York City yesterday. Super nice guy.
Will Buxton does a better grid walk than Martin Brundle. However Brundle is the better play-by-play commentator.