Car audio questions help me?

I was wondering what would be louder, what would sound better, and what is more suited for my car.
I was thinking of getting an Fi Q 18 sealed in 6 cubes or an fi q 15 ported 4 cubes tuned to 32 hertz.
I have an oldsmobile car so I was wondering what would sound better and hit harder.
My friend told me sealed hits on your chest harder but ported is loiuder
your opinion is greatly appreciated
 
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