ronnie in snooker is in a class by himself
but you would have to consider harold worst the best all around player in history for all carom games and all pool games (except banks maybe) and snooker
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this from the link below
"Worst played at a world-champion level at three-cushion billiards, straight rail billiards, balkline billiards, nine-ball, one-pocket, straight pool and snooker. Bank may have been a possible weakness, but Worst was a cut-shot artist who didn't need to bank often, and to my knowledge there were no major bank tournaments in his day. When Worst was at his best, the championship games were the aforementioned ones. And during the last year of his life, before he died of terminal brain cancer at age 37, Harold "The Best" Worst cleaned everyone's clocks at those championship games. Furthermore, who knows how much better he may have become, or how long he might have ruled the billiards and pool roosts, if he had lived longer?"
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"Worst is one of only five players, and the only one in the modern era, to have held world titles in three-cushion billiards and pocket billiards. And he is the only player to switch from three-cushion billiards to pocket billiards and win world championships in the latter. He also remains the youngest player to have won a world title in three-cushion billiards."
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