Single 3.7V cell takes up less room, and is cheaper. Best is a tough one. Prizm is the cheapest and simplest board that supports color changing. Take a look at the comparison chart. At the end of the day, best is going to depend on you, your skills, and your plans for this particular saber.
That's correct. The soundcard dictates the battery. The battery voltage is critical to the resistor calculation.
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