The powrkoil 18 is a rather strong cover, yet I havn't tried it against the ultimate or the strike, the only two balls which I know to have activator solid. I have used my total along with the strike, but the cores are not similar enough to call this a just comparison. Never the less, the total is stronger, but I can't help but think this is due to the vanguard. If I was to say, the activator solid is probably slightly stronger than the pk18, but this difference is more than made up for by the vanguard core.
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