Both were great players at their peak, BUT Keith had a bigger scare factor. This was not about running racks, but more about coming with near impossible shots under pressure and making it look easy. No one ever had that wow factor like Keith. He could switch hands with no drop off in ability. And no one ever handled pressure like Keith. In fact he embraced it. One game for all the cash and a tough rack to run and I'll take Keith over the world. No bet was too big and he feared no one. Keith would play Godzilla if he had a cue. There is a good reason why he is legendary. In my 50 years in pool there has only been one Keith.
Back in the 70's and 80's when Keith played a lot of tournaments, NO ONE wanted to draw Keith. He ran racks with far less effort than anyone else. It just looked too easy and that was scary to all the other ''normal'' players.