Core of Ar'kelos recommended over Slayer's crest?

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I can’t comment on this without any context. It is best to create a snapshot and tell us what you are looking at in particular (best in bag, best in slot, etc.)

Instructions to make a snapshot:

New "Help" Link Support Feature

Next to the big section titles of the optimizer features (“Best in Bags”, “Upgrade Finder”, etc.) there is a “help” link in green. Short Version: you will get much faster support if you press the “help” link next to whatever feature you need help with, then click Create Support Post, then copy the generated 32-character snapshot ID into your post with a description of your issue. Nine times out of ten if you don’t do this, we’ll have to ask you for the snapshot anyway before we can help you. B…