Because there's an ordered phase-out for all three, I think the rule of thumb is to use the one with the lowest threshold that you're eligible for. This means:
Traditional -> Roth -> Backdoor
This is clearly true for the Roth before Backdoor decision as they're functionally equivalent but one just takes a bit more work. Traditional is usually favored here as people expect their income to be lower in retirement, but there are always exceptions.
Actually, it probably goes more like this:
Roth -> Traditional -> Roth -> Backdoor
Since if you're in the 0% tax bracket, you should almost certainly invest in a Roth.
Also, as tax rates increase, everybody will have their own calculus as to how high of a tax rate one should lock in now (using the Roth) versus an unknown tax rate many years in the future (Traditional). Most Mustachians consider it highly likely they will pay 0% on that money if they retire early or, if they work to full retirement age, a higher percent would be no big deal because they've "won the game", so the Traditional would win at even small tax rates over the Roth.