Sealed all the way, you get more bass IMO. When you port your box you are going to have to rebuild the box as a ported box requires more air space for the woofer to bang properly.A good sealed box you can press the woofer in and it will rise back up slowly. SQ ft = L X W X H / 1728 for cu. ft. most 10 and 12 require roughly right at 1.0 cu ft for sealed vs up around 1.5 for ported.Check your woofer for optimal perf cu footage though.