It was probably lag, and he was click happy lol.
Anyway, on topic, sealed and ported are different - one is not better than the other, it's preference. If you want fairly quiet, and more bass to 'feel' then go for sealed. Where as if you want loud and kicking bass, go for ported.
I would recommend ported, as you're getting 2x the efficiency from the subs, due to using both wave directions created from the sub cone. So if you've got the space, go for ported, if you don't then go sealed, just my two cents.