Wiring Multiple Subwoofer Drivers

 I’m in the process of installing new sub drivers(Dayton Audio RSS265HF-8 ohms impedance) into my pair of Kinergetics SW-900 cabinets. Each cabinet will contains six 10” drivers. I have two options for wiring them & can’t decide which to do! I would like to know if one is better than the other & the pros/cons of each. The two different wiring diagram I’m considering are:

2 sets of 3 series drivers run parallel= 12ohms

3 sets of 2 series drivers run parallel= 5.3333ohms

12ohms:

Pros- higher damping, less distortion, less resistance, less wire

Cons- less power

5.3333ohms:

Pros- more power

Cons- less damping, more distortion, more resistance

My audio pro friend (who is much smarter than me) is assisting me with the subs, he states wiring them for 12ohms is better.  But if that is case make OEM drivers & speaker designers make the products 4 to 8ohm impedance normally?

Thank you for any input, advice or suggestions!

Paul