Sealed handles more power and plays lower. They are 8s though.. so they aren't going to boggle your mind with low end.
Ported would be louder but looses what low end you could get.
regardless of if you choose ported or sealed;
if you are going to run peak power, go with the smallest enclosure.
if you have medium power go with a medium sized enclosure.
if you have low power, go with the largest enclosure.