It states clearly in this manga page that Orochimaru prefered Kimimaro's body MORE than the one of an uchiha.
Why? Probably because the Kaguya clan had the younger brother's body strength, meaning that they also are their descendants. Just like the Hyuuga clan are also the descendants of the Older brother.
Imo what orochimaru really wanted was the body of a senju (or at least someone who had great strength in their body), the power of the eyes could simply be transplanted and that's why he wanted Kimimaro's body more than Sasuke's or Itachi's
Lol, just some of my crazy thoughts I wanted to share

(I'm a Kimimaro fanboy xd)