I think they are like shoes, everyone's body is different and sometimes you just have to try on a lot of different styles to find what works best for you. I drove over 90 minutes away to try on bras at Athleta. My local running store is great for shoes and some accessories, but not clothing and especially not sports bras. The girls at Athleta were super. Everyone was cheerful, friendly, and helpful. I tried on 12 different sports bras before deciding on the Jubralee from moving comfort. I'm a 34DD and the salesgirl helping me was a 32DD, so she could relate and offered tips. Now that I know what works, I'll be buying online since nothing is close enough for a regular trip.