Saluki greys take rabbits by the abbundance. They take down decent size deer, they take foxes, as do collie grey. Yes they will catch the best of hares on big land, some collie crosses might not if at all, as some saluki x, but not in numbers like a saluki hybrid. Like you said. So unless your after hares, its preference. Every saluki hybrid is different as is a collie grey. But dont get thinking a saluki hasnt got brains, its the most cunning killer off all. i would imagine a collie cross grey easier to train, prob more obedient. Prob depends on how much percentage of collie as well. More col