I'm constantly changing my mind on this, but I'm going to go with Circus. The first 7 tracks are perfection. The rest are still good enough.
Same for me too. I often jump between Circus, In the Zone, and Blackout......personally, In the Zone has a lot of legendary tracks but Circus resonated with me more. Womanizer, IUSA, Shattered Glass, Unusual You, Circus...
In The Zone
(I've Got That) Boom Boom, Early Mornin', Outrageous, Touch Of My Hand , Toxic, Me Against The Music, Everytime >>>>
I ****in' Love Every Track Form ITZ , Her Best Album