Crystal 3 seems a dead end to me, seems to be such a "active" league. G2/G1 and masters have given me the most luck/consistency.
Hope it helps
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Bit of both, inactives are always lovely (still make sure to grab the 50%) but hitting bases with storages near the edge and having heros is usually the main tactic up there. Barching out the majority of % and using heros for the cleanup if needs be or using them to exploit easy storages.
Hope that helps :)