for normal if you get meds, hover tanks, queens and sakatas your'll all set, if you feel fancy you can throw in some far snipers as well
low tech - infinate grodetz for 1 person, sakatas and phantoms for another, havings meds never hurts.
eq - i suck at these dont ask me
dog fight - be facist, 1 person makes a forge right away, the other a bank, the person with the forge parks scouts by the enamy base so they cant spawn and keeps doing that intill the person with the bank makes a forge and does the same, person with forge gets bank, gen gen keeps makin scouts, person with bank does the same, be sure to keep fresh scouts by the enamy base so they cant spawn.
although thats if your playing 2 win not 2 have fun.
For low tech actually snipers+chronites is one of the best ways.
At low numbers, groditz can easily destroy chronite tanks, but once you get to like, 15-20 on each side...
It's fairly easy for chronites to get in and then fire a volley at the groditz, destroying them all at once with splash. Snipers could lay down covering fire too.
EQ is just try to get out a quick sniper blockade, then flesh it out with chronites, hovers, more snipers, and either a few groditz or glads (you need them to help kill auto-romans)
For normal it's best if you don't keep your units bunched together in a huge group.
For EQ - having one person making a sniper blockade and then adding hovers is never a bad idea, while the other makes far snipers and prides, depending on the situation.
ok for EQ make a: bank hospital: ok set it to auto-build on the manapower outpost: when you get this use rally point then auto-build tanks,wait till you have 6 then send but keep the tanks on auto build and you should win
Well i believe That Almost Any Strategy can be Good if you include micro For instance Forge 1st Everyone Says Ss forge First you will lose yet my micro lets me win most often So i would have to Say Micro makes the strategy micro and macro
Like several people said, it depends on what mode, and whether its 2v2, or 1v1. But, it never hurts to get hovers ASAP, with meds, along with a few snipers.