Whats better for a car audio?

whats better 1 18 inch zebra sub or 2 twelve inch rock ford fosgate subs? please let me know immediately cuz i might be trading my twelves for it and i wanna know the specs on the sub cuz i cant seem to find them anywhere
 
JL subs are the best perferably but keep the 2 twevles a zebra lol sounds like junk
 
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