Wizards still cost more time, time per army camp space taken is all that matters when considering training an army.
Dragon
30 min / 20 space = 1.5 min per space
Golem
45 min / 30 space = 1.5 min per space
PEKKA
45 min / 25 space = 1.8 min per space
Wizard
10 min / 4 space = 2.5 min per space
I'd be fine with Wizards being on par with the three above because of their power, but at present they are far and away the costliest troops time-wise.

