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Well, if you can't go for both, I would rather go for refines. Personally I just 3 starred my 1010, and now I collect all refines, but if you can't afford both you might be better off with going for power. That is unless you are Water Main with Mabui who wants to go for round 1 obliteration :D Well, there are more strategies with 1010, so the decision is for you to see whether any team with gnw1010 is appealing to you :D