Do you really want to carry around another key with you just for the safe/risk losing it?
The only real choice in my mind is between 3 & 4 number combination, and to be perfectly honest 3 is sufficient.
Most people who see the safe (if they've already gained access to your vehicle) are going to be dissuaded from bothering by its presence.
If they're so incredibly intent on getting into it, 3 or 4 number combinations aren't something their pry bar, drill, etc are going to concern themselves with.
Frankly, if you're living in an area where car burglars are using pry bars, drills, etc, you should move. lol
Tl;dr- 3 number combination is perfect
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Can the Console Vault stay unlocked with either the combo or key lock? I would assume the keyed version can (if the key can be removed when unlocked), but does the combo version automatically lock every time you close it?