The very very best I have seen, in terms of entertainment, is Jurgis Kairys in his 450hp Sukhoi 26M. Absolutely mindbogglingly good. How is 16 consecutive snap rolls in the downwards vertical stopping precisely on his intended exit line? Just for example.... or a "cobra" on take off from 20 feet ...
Technically, Xavier du Lapperent may be more accomplished, but IMHO, Jurgis flies a display that is more entertaining to the general public - Xavier appeals to the more aviation / aerobatically minded audience.
Shame that Jurgis is not often seen in the UK - a bit of a hike from his base in Lithuania. Storming aeroplane though. Spins a huge 4 bladed prop and has to be the ultimate SU26.