My choice for northern bermudagrass would be in this order:
1. Ozark - Most cold tolerent, Most production.
2. Tifton 44 or Midland 99 - About equal in cold tolerence. Tifton 44 may produce a little more. All are hybrids and have to be sprigged. Would not consider any others. Even if the seeded varieties would survive, they could not come close to matching the production of these 3 provided you get enough rainfall and properly fertilize.