I love BOF- there's Lee Min Ho (the sole purpose and motivator for me to finish up the horribly rewritten drama), Kim Hyun Joong (although the hair color didn't suit him period and the fact that I really dislike his character), Kim Bum (he has a killer smile) and Kim Joon (he's just so adorable) they made it worth my time. The major turn off that I dislike about BOF, they choice the wrong girl-Koo Hye Sun. She doesn't have much charisma as Gan Di and her acting is a bit not to my liking. If only they have chosen a different female lead it could have been one of my favorites.
As for You're Beautiful, it was kind of difficult to watch with the fashion style, but later it really fits the whole drama plot, environment, mood and you just come to like it even though some wardrobes are "WTF are they wearing" lol All castings were great, I have no complaints in that department.
I would have to say You're Beautiful wins hand down even though it's not the greatest drama of the year, it's definitely worth watching and very enjoyable unlike BOF where I had to clench my teeth almost throughout the whole entire show lol... this is definitely going on my favorite list for Kdrama.