I know they recruit senior professors. Actually, I am from dept of statistics. I would say dept of statistics is good. But dept of biostatistics is just so so. A program's reputation can't be established in a short time. I strongly suggest Emory
I am a master student at Univ of Florida. As far as I know, the biostatistics program is a new program. They even don't have many graduates yet. The placements is not yet known. If you have chance, you would better visit the campuses. Absolutely, Emory is a good choice. A good school has best resources and can bring you much more you can imagine!