All subs, as folks have stated, provide different types of sound. The smaller the diameter, the tighter and cleaner the bass will be. However as the diameter increases, the depth of bass increases. So 12s will be slightly more 'sloppy' than 10s but will hit deeper.
Multiple speakers will give you even more boom, but so will a well placed and sized port. I went with a 10" pioneer competition sub with 1.1 cu.ft. and 3"x6" aeroport. The dimensions, air space and enclosure size will do more to produce better sound out of any speaker than adding power or size ever will.
If you have your box already, choose speakers that meet the dimensions of the box
If you have your speakers already, choose a box that matches the specs of the speaker
If you already have both, you may need to modify the box to obtain the best sound.
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