Obsidian audio subs, vs kicker cvr?

I have been looking to to put a loud system in my truck, and have been planning on 2 Kicker cvr 15's in a prefab ported box. Well, I ran across a new brand of subeoofer that is made by the owner of sundown audio, and another competition brand. This brand is called Obsidian audio. There prices are really low! ($148 18" subwoofer pre orders!) And $158 15" subwoofers) ans these things are build nice! But what do yall think??

I was thinking maybe 1 18" in a custom built 5 ft^3 box ported and tuned at 32 Hz. Or if I can save enough money 2 15" obsidians in a prefab ported box.. but I probably won't be able to get 2 so

Which would be louder

3 kicker cvr 15's

1 obsidian 18" in custom box

Or if possible 2 15" obsidians in prefab box.

If i had the room I would go with 2 18's

Yes, I do have the electrical system to power this, and I do have the amps..

So what are some opinions about obsidian, and what should I do?