A lot of our goals come from the right wing. Teams play to both their strengths and opposing team's weaknesses. Obviously ours is the right side of our defense. A young player still learning his trade and a old warhorse on seemingly his last legs.
I think for majority of the games, even for the likes of Arsenal and Liverpool, Rafael will be fine as they aren't that potent on the left side. Against a Chelsea or Milan though I'd go for Brown - strong and more unlikely to get caught up for defensive lapses.
Still think every time I watch Rafael, he seems to have grown in his game. The positional boo boos still happen but, he more and more he does the fundamentals right. With the help of Valencia right now, what defensive liability can be masked to a degree and he offers hell of a lot going forward as well.
BTW - watching the CC Final again, I really am pissed off at A. Young. There was a time that Rafael was getting past him and fortunately he moved his leg just enough but, Young looked like he intentionally tried to hurt the kid. After his reckless challenge in the league that didn't even get a card (and gave them a throw) and now that, I won't shed a tear if someone does some serious damage to him.