I think B2B is her most cohensive album to date, it is a whole body of work.
Stripped is also amazing, includes some of my fav. songs of her.
Bionic gives me mixed feelings as album, but has some amazing gems and I basically like to love every track on it.
Lotus seems to be around Stripped for me, every snippet sounds promising to me
It really is a great album. It is pretty long though and has a lot of slower or midtempo songs. It's a good example of an album where the individual tracks are almost better than the album as a whole.
Back to Basics > Bionic > Stripped > Christina Aguilera / Mi Reflejo
Lotus ain't there cause I need to listen to it first. Burlesque SLAYS but it's not there cause it's not an official studio album. My Kind of Christmas can get the **** out.