Hellbound,
With general drillings, and standard out-of-the-box covers,
The Sonic Boom is for light to medium-light oil patterns,
while the CrunchTime is for medium-light to medium oil patterns.
The SB will go longer than the CT on their overlap territories, with the CT going earlier, but not early (after all it is a polished resin pearl) and with more hook overall. The CT has a lower RG core for earlier hook than the SB's higher RG core. The CT's core also has a larger RG differential for greater overall hook.
The SB is an enhancement (and replacement) of the Sonic-X pearl you already have.
Given these facts, and if you MUST choose between only these two balls, my opinion is that the CT fits better between the two you already have.
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"We get old too fast, and too late, smart."