also, typically sealed boxes require more power to control the motion of the driver. uncontrolled motion = distortion. Ported boxes are more efficient with less power, but often have a louder resonant freq. spike. sounds boomy, but can also sound more punchy if that freq spike is in the upper bass freq range...say 50-60 Hz.
with 2 10"s you should have plenty of bass with either design. If you go with a nice powerfull amp...go the sealed design.
BTW, I've seen a LOT of drivers destroyed by running them in sealed boxes with improper volumes at too high dB with puny amps. My advice is to build the box u want and TEST it before you cover it/finish it. see how it sounds before you spend all day working on it.
for sealed boxes, i use a test box that has an adjustable volume, by means of a back pannel that moves in and out like a plunger. You could build one of these with not much more effort and fine tune the response of the sub, then remove the extra material and seal the enclosure properly. test it IN your car to see if you like it.
just some suggestions