I like Blitzkrieg, Hit & Run and Flank striking. Quick offensive strikes and a decent home defense.
The flank striking is for when they send out large forces. I send in faster units to wear down on them and hopefully take out a few.
We all know what Blitzkrieg is (Trans: Lightning Warfare) but I don't people to say that I rush. With Blitzkreig you send in a large force of heavy armor to quickly roll over the oposition. Then you send in infantry one step behind to mop up. During the whole battle you have heavy air support. I use this stratgy when I need to gain room and fast.
Hit & Run is for disrupting enemy movement and production. With outgoing enemy units, I'll slam them with a few quick ground units and a bit of air support, while with their base I would have a quick artillery strike/air strike and then move my units out of range. The artillery strike would be aimed at power plants to achieve maximum disruption and collatoral damage.
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