Jville140db

I will soon be building a new enclosure for 6 0f the new 12in 5500 mtx squares and i am trying to decide on a port method I would like to see big numbers on the termlab. My question is what are the pros and cons of a kerfed port vs a standard slot vent vs flared round ports. I have used used both slotted and round flared. I have plenty of room to work with as it will be a wall but don't know which will yeild the best numbers. Thanks for any help