What troops are more important to upgrade?

Goblins!
10 Chars

I usually upgrade the Barbarians first just cause they are cheap and they are basically a "Bang for Your Buck" kind of deal. For the very short upgrade time and cost, Barbs are very efficient for Trophy Pushing and also for Farming.

For me, it was done in the following order:
-archers
-barbs
-giants
-dragons (only because I needed it for clan wars)
-wb's
-rage spell
-wizzies

Then the rest of the stuff doesn't really matter because I don't use them as much.