I think barca is more comfortable with possession, i mean they are capable of keeping the ball longer. Most of the teams just concede possession to bayern, but we won't do that. If busi does not play, bayern will have around 60-65 but with him we can slightly win the possession battle. That is how good busi is and he is playing great recently. My guess we will win possession in first leg (55-45) and return leg bayern will win it with same numbers more or less.
And if we take the lead early in first leg, we will definitely win the possession battle. If somehow bayern gets the first goal, they will be the ones keeping the ball and we will be the ones chasing it. It all depends on who gets the first goal.