I have been on something like 9 different BCPs... and while I didn't switch from Yasmin to Alesse, these are two pills I have been on.
I liked Alesse - no moodiness, I was able to lose weight with exercise, my excess hair problem lessened... but after 3 months on it, I was still having breaktrhough bleeding. My doctot said the estrogen level probably wasn't high enough for me... I don't know. I have never really understood what makes one pill cause BTB and not another...
On Yasmin, I was moody as hell, acne was terrible, and I also had BTB. Yasmin has more estrogen than Alesse - but it also has that Spiro-derived progesterone component and I suspect that may have been what caused the bleeding for me. Spiro makes me bleed, too.
One of these days I will find the perfect BCP. Next in line is Ovcon...
I really wish I didn't have the bleeding with Alesse. It was so good for me otherwise...