The feature that most distinguishes a joint tenancy from a tenancy in common is

Both joint tenancy and tenancy in common involve undivided interests in the property, meaning each owner has an equal right to use and enjoy the entire property. This characteristic does not distinguish the two forms of ownership, as both types of tenancies share this feature.

Unity of possession refers to the right of all tenants, whether joint tenants or tenants in common, to possess the whole property. This is a shared trait in both forms of ownership, as it ensures that all owners can access and use the property without restriction, making it insufficient to differentiate between them.

The right of survivorship is the key feature that sets joint tenancy apart from tenancy in common. In joint tenancy, when one owner dies, their share automatically transfers to the remaining joint tenant(s), whereas, in a tenancy in common, the deceased's share goes to their heirs, not to the other tenants.