Filing in a state that you aren't yet doing business has no benefit and could actually hurt you.
By registering in a state you are consenting to being sued there. Why would you register a Delaware (or elsewhere) LLC when you are in California. Bad idea.
Second, if you don't register in your home state it could be found that you aren't operating an LLC at all. Say hello to personal liability for your debts.
Register in your home state, and as you expand to operations/contacts in other jurisdictions, register there.