Next lab research?

I am currently a TH9. I'm looking for advice on what I should upgrade next with my laboratory and what is the best 3 star war strategy with my troop levels. Here are my current levels:
barbarians, archers, goblins, balloons, wizards, wall breakers, giants, heal spell, rage spell, minions, hog riders, and lava hounds are all maxed for TH9.
Healer-3
dragon-2
PEKKA-2
lightning spell-4
jump spell-2
valkyrie-1
golem-1
witch-1

Get your dragons up.

up your witch n golem

I vote for Golem and Pekka for the gowipe

pekkas and drags are not quite useful as th9..

Golem first then witches, for war using gowiwi

Is the witches upgrade stats really worth the dark elixir?