someone will correct me if i'm wrong. but i think the bandpass will typically allow lower response where sealed will produce quicker response. so a sustained low note in a song will come across better threw band pass but rapid fire bass drum action should be cleaner in a sealed box.

i have a single 10 in a bandpass box that has been my "something went wrong with the other gear" system for a long time. to me it sounds dam good in the trunk of my gs now since my rainbows took a crap on me.