Best Battery For Reuleaux RX200?

I own a WISMEC Reuleaux RX200 mod. It takes 3 18650 batteries and I was wondering if there is a “best” battery for this particular mod. What is the best brand, the best mAh rating (2100, 3000, 3200), should I be using, or does it matter?

Also, I hear people talking about “marrying” batteries for dual and triple 18650 mods. What does that mean and is it important? Thank you!

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