What are advantages vs disadvantages of them?

basically if you are working with very limited space you go with sealed.

aside from that a properly tuned ported enclosure is the best all around option if you want to get the most out of your subwoofer(s).

So for 1 12 inch sub in a hatchback i should go with ported?

This.



Yes...

People tend to go Sealed for more SQ or Sound Quality oriented setups. Where as a ported sub would be used to get the most sound out of the speaker it will be within a limited acoustical range depending on what your port is tuned to. There are some speakers that can be tuned lower to have a nice ported sound but many people dont tune them properly and just created noise. What subwoofer is it for is the most important question.

I have had both ported and sealed boxes with a ported box they hit harder and are louder, with sealed boxes sound better
If your looking for a competition system go ported if not it don't really matter but I like ported

This basically

I like sealed

with a sealed box you will get more of a punch with your subs/ or sub. i have had both as well but i like sealed because of the music i like to listen too. mainly rock. but if you listen to songs that have a lot of low bass ported would be the way to go.