When I was choosing between the two, I personally felt that both the block interval and coin generation schedule were better in BBR. But unfortunately all the other things were worse, with legitimacy on the top of the list.
Why only pick one, and not both? Since CryptoNote is very new, both coins have a chance to be the sector leader. BBR may get stuck being Pepsi to XMR's Coke, or become the dominant CN coin if there is an XMR catastrophe. Those are both winning outcomes.
BBR may be the next BetaMax (better tech killed by QWERTY effect) but that's why I only spent 10% as much on them.