8 12's 4th order help please

[Fi4life]

I have a 98*dodge*ram*1500*ext cab dodge with 28-29 cubes to work with. Was wondering would 8 CT sound strato 12's in a 4th order (4 on top angling down and 4 on bottom angling up) be louder daily wise vs 2 18" sp4's in a 4th order. My mind is set to 4th order no matter what. My box builder who is known for 160db+ builds can get either done. I'm aiming for loudest daily musical. Amps will he 2 CT sound 4k's. Battery's and amps in a*tool*box. Stratos rated at 900rms each. Sp4's 3000 rms each.*

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