the anwser is yes. and it has alot to do with port tuning and what the end user wants. slot ports tend to have less distortion then, a circle port but the main reasons for this is port area/ and proper port tuning. the larger the port the less huffing or air noise you will have out of the port which means less unintended noise you may be able to hear over/with the speakers themselves.
A ported box reactes almost identical above the ports designed frequency but in the ports frequency there is usually a 2-3db gain in sound volume over a sealed box. square ports also tend to be easier to set up for a low frequency becuase you can have a port with alot of surface area and the appropriate legnth. As you increase the size of the opening of the port the length must increase to compensate. its easier to snack a square port down down the sides and back of a particular box then a piece of round pipe.
I don;t think people are trying to be critical of what you want but you have to remember atleast half of the way a system sounds whether SPL or SQ has to do with the install. Your buying some really top notch components and then it seems skimping in some other real important areas. What your looking at buying will sound good and beat down, but the fact remains it would still have the potential to be better. kind of like torque monster headers verse ford motorsports headers for the 5.0's. If your wanting to order things for ease of install I can understand that. Have you ever worked with wood before? Do you have a saw and a place you can work for an afternoon. I would really look at building a box, it tends to be cheaper and in the end it tends to come out better. this kind of goes along the lines of the post I made advising you to see if you can check resonancey frequency of your individual truck. if you tune a port to that frequency you get another 2-3db's and you seem to be going for sound volume over other things like space/sq/budget.
heres a good link regarding ports and calculating them. etc.
port calculating jl audio