Usually, the best starting gear for a build is great with stats like WD%+, ED%+, or set affixes like Rage our Momentum because the gear with it is the only gear that can get those stats. Like the Crimson Cover is the only helm with Stun Immune. You can't roll it with Ruby, either. Slots in the gear already are helpful, too. Unless you have a fuckton of Zircons.