Dunno if I'm qualified to pass judgement on these experts, but here are the most memorable displays i've seen..
Xavier de Lapperant in his SU31 at a 1999 display in France - he made the aeroplane stop in mid air! That was impressive.....and the whole crowd stood and applauded for ages afterwards..
Lee Proudfoot and Ed Shipley in a 2 ship P51 Mustang formation at Duxford Sept 2000 - Outstanding, flowing, precise!
Pete Kynsey in Richard Parker's yellow Harvard at PFA Cranfield in 1987 - sheer poetry and energy management.
RAF Lightning and Buccaneer displays in the 70's & 80's. Pilots unknown, but wow!!!
Ray Hanna and the late Neil Williams flying MH434 at Biggin Hill in the 70's - 2 legends.