Now I'm going to be speaking in generalizations, but I think the vibe is that sealed is better for musicality and ported is better for generating more output.
I tried sealed and I did find it to have great musicality. But for movies it just didn't have enough output, so I went with ported. It's a trade off between the two. Of course, you have many exceptions to the rule, like people using variable tuning modes in their HSU subs to jump between sealed and ported modes, the best of both worlds.
Then you have subs like the HSU ULS15, which is an monster sealed sub that has strong output. The Epik subs also have tons of output as well for sealed subs too, which makes them exceptions to the generalization.
I suppose you really have to ask yourself what kind of sub do you need for your particular space and set a budget.