Well, to be fair to the snooker professionals, they don't have a lot of incentive to leave the high-paying world of snooker (a single top finish buys you a new Tesla) to try out pool when the prize money would barely cover their airfare, but could probably do so with the right amount of effort. If you watch Chinese 8-ball, snooker players do very well there.
Alex is a plenty good snooker *shooter*, it's just a very hard game to know when to roll the dice and make your move, playing those long, long matches against players with more experience.
Both are fun, and no Ronnie wouldn't win the US-open 9 ball without a lot of preparation, but I've never seen even a novice snooker player who couldn't walk into a pool room and make a meal out of people in 8-ball or 1-pocket.