The 18s will have 509 sq in. of cone area
The 15s will have 530 sq in. of cone area
That's a pretty similar number right there^^... 3 15s vs 2 18s of the same sub, the 15s will obviously have more motor force, but you have to consider you'd be running those 3 at lower power with your amp. I'd get 2 18s... A lot of nice subs can handle 2kw rms perfectly.
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TEAM XS - MECHMAN - FI - AUDIOQUE
152.6 OUTLAW AND CLIMBING