Basenjis are considered both sight and scent hounds. Although mine make good scenthounds, I think of them more as sighthounds because they don't have the 'look' of scenthounds - no hanging ears to help fan scent in to the nose, a narrower muzzle, etc. They do have the wrinkle, but not so much on the front of their faces around the cheeks and nose or the hanging dewlaps. (Think Basset or Bloodhound)
Basenjis may not have the leg of the Greyhounds or Salukis, but they are very fast and very agile. They can corner much more efficiently than a larger dog.