Perhaps I’m blind, but I would assume that the BiB function also grabs any legendary upgrade “stones” and thus would know which legendary can be upgraded to which level. Then the Upgrade Finder should tell me which one to upgrade. Or am I doing it wrong?
If you go to upgrade finder and set settings like I have them here. It should show you what your best legendary is.
Unfortunately BiB doesn’t know that you have an upgrade item and you’ll have to upgrade them based on Upgrade finder or yourself.
I think you should upgrade the ones you’re using first obviously and then the order is really up to you.
I think a better way to decide which to upgrade is to set the legendary level to 1000 in options, and do a best-in-bags optimization. The ones it picks are the ones you want to upgrade.