Haven buildings.

I disagree; in my opinion, it's the most advantageous option in most cases: mage - djinn - dragon golem.

The dragon golem is extremely weak; even the first strike doesn't save it. The dragon is only effective for clearing out neutrals, in conjunction with teleport and djinn support. But Titans are just as good; cast accuracy on them, slow down everyone with djinns, and practically any neutral can be easily defeated. And in some cases, it's convenient to teleport a Titan as well; the lack of a penalty in melee combat is a big plus.