In between frame Sizes

I am 6”2 with my shoes off, closer to 6’3 with shoes on. My Wing Span is about 6’1. I am wanting to get a Roubaix comp. looks like I am in between the 58 and 61 frame size. Any advice on how to go about choosing between the two sizes? Rode both sizes today on a trainer at LBS and could not really...