In TH8, it seems that I am likely to finish upgrading walls and buildings long before I am done upgrading in the lab, so I want to prioritize troops that I are going to continue being useful as a late TH8 and early TH9. In that vein, I plan on maxing out the things I use frequently for farming (Barb, Archer, Giants, Spells) but I'm not quite sure where to go from there.
Since TH7 my primary war attack strategy has been mass Dragons, and they are currently level 2. However I hear that Dragons are not really all that useful in TH9 and above. Would it be better to do Wizards/Pekkas, or Balloons/Minions, or Hog Riders? I'll do them all eventually as time permits, but what's the most efficient to get done prior to getting to TH9?

