Why breed matters, and why it does not
People bred dogs for jobs for hundreds of years. Some of those jobs were nose jobs: following a trail, finding game, flushing birds. Those breeds often come with a lot of drive to sniff. They can be quick to learn and happy to work for hours.
But every dog has a nose. Even short-nosed and small breeds have a strong sense of smell compared with ours. Within any breed, individuals vary a lot. A calm bloodhound and an excitable one will search differently, and a mixed breed from a shelter may out-search a registered purebred.
So use breed as a hint about style, not a limit. You know your dog best. See can any dog do scent work for the bigger picture.
It also helps to remember what "drive" means. A dog with a lot of search drive wants to keep going. That is great for stamina, but it can mean the dog gets wound up or rushes past faint odor. A dog with less drive may search slowly but carefully. Neither is better. They just need different handling.