collins, in reality you'll get the worst of both worlds. the benefits of one box would be cancelled out by the drawbacks of the other kind of box, both ways.
what are you after here? SQ? SPL? There are a lot of enclosure types, and I'm sure one would fit your needs just fine if it's done properly.
best rule EVAR in the car audio world: keep it simple, stupid. the less you complicate things, the less chance you'll have of running into problems. simple,, clean, and elegant will just about always work out better in the end compared to overly complicated and flashy.
