I am looking at picking up a Phoenix Mod unregulated box mod. The mod in question is unregulated parallel and comes in a triple 18650 or dual 26650 configuration. I know this is what I want as I like a somewhat warm to hot vape and this mod would be safe for the .15 to .30 builds I like. Any opinions why I should choose one battery config over the other? Also, I can opt for pure silver wire for an extra $10. Is it worth the $10?