They're good hot weather grasses, are disease resistant and can be mowed shorter than bluegrass. But they stay green only 4 to 5 months of the year. Here's an evaluation of their advantages and their limitations.
Roberts, Eliot C. and Cott, A. E.
"A New Look at Bermudagrass and Zoysia for Iowa Lawns,"
Iowa Farm Science: Vol. 19
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol19/iss10/3