My wife got a steel model --white dial RO with bracelet auto movt 2140 and likes it very much. It can be use for day or night and very sporty yet understated. The diamond bling a bit but this is what woman likes most ! As for the quality of the product (technically and finishing), it is very good and among the top gun.
For the ladies'Millenary, it is not that special, however, it depend on individual taste, The RO, it is a icon for AP products for many years and till today, it still a very propular model among man and woman.
Select the piece she likes the most and Just enjoy for many year to come ! Cheer !