The Old Testament (in Logos) doesn't have much in the way of in-depth apparatus. For hebrew, BHS is largely a summary. Ditto the Samaritan. For greek, Ralfs has another varient summary. Gottingen has considerably more varients. Latin is quite thin (Vulgate). And Leiden/Syriac is similarly thin. A couple monographs for coptic prophets and Philo have more in-depth discussion.
But ...
Quinta (hebrew) and Septuagint Commentary (greek) have a lot more discussion in their respective apparatus. Even better, if all you need are these, you can buy the SC ones stand-alone or Quinta by book: cheap! Here's samples:
1. Quinta: Genesis (just shipped)

2. Septuagint Commentary: Amos. Not all volumes have apparatus. And those that do, typically have lengthy discussions of the sources as well.
