Need pros and cons of 12s and 15s. Cant decide which to get

there my jbl gti subs i alrdy 3 12's but i had them then here was a problem then the got stolen form the dealers place so then they ordered me some more its been almost 3 months i talked to another dealer about the subs he will give me a better price. this other dealer has been giving me the run around for a while so im going to get my money back on friday. i alrdy have a sealed box for the 12's but i can easily make a sealed box for the 15's it wont be much harder besides i never made a box and this can be my first i plan on doing a wall in the future but for now i can build a cheap sealed box for 15s if i get 3 of them. i plan on having total of 6 though.

 
ur not gonna have enough room for 6 15"s in an echo unless u build a wall.
i am building a wall but i cant decide on 6 12's or 6 15's i am going to use 3 12s/15s in a sealed box temp then i will build a wall in the future but going to make a sealed box for 15 or use the sealed box for 12s it all depends on which size i chose.

 
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