Depends on the faction, Romani I'll do H or VH campaign, H battle, for those I'm relatively familiar with, H/M and for those I've just started playing since the new version added enough to make them playable, M/M.

I haven't tried a VH campaign since .7x however, since I did it as the ptolemies once and I lost within 10 years because I couldn't consolidate my forces to stand a chance fighting back and they kept sieging my cities, all the meanwhile seleukia was chomping down on me so no help from the east.