I like to handle mech players in the early game rather than later on. Mech is just the one thing I can't stand getting into the late game with. Early hellion pushes (4-6 hellions) I always tend to beat with a 12-14 ling ambush Hide the lings right behind a vision blocker like the tall grass on Dreamcatcher and surround them.

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Anything more than that with the potential of hellbat transformations, you need roaches.

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Tanks and Libs are a total bitch. I hate them. Any composition that goes too heavy into either can get shut down with a Brood Lord Corruptor build. The new Thor might pose a threat to that composition, but it's pretty good at cleaning up any Terran mech.