Simple answer is to find someone youre going to get along with - as you'll find one session is prob not enough.
In my experience, Rob Wilson is fantastic - but teaches you a totally different technique - so be prepared to have at least half a dozen sessions to get the hang of. And - he's not cheap...!
Of the other names - I have no first hand experience - but John Pratt is very experienced and was a very good driver (and a good guy). I would also put Ben Clucas in same bracket.
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