Should I buy a fi btl dvc 2 ohm or one for a aq2200d?

[thompson 10+ year member]

I am planning on buying a 15" fi btl tomaro or maybe tonight. I would like to know what would be better? Buying the sub in 2 ohm or 1 ohm. The sub will be hooked up to an aq2200d and a 220a alternator with two kinetik batteries. I know that wired in .5 ohms the amp will give off more power but be less efficient. In 1 ohm is what the amp normally operates in. So should I buy the 2 or 1 ohm btl? Another question is does the universal option effect the sub's performance in any way? Any suggestions would be appreciated

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