You are right, this is a topic that is heavily debated and there is research going both ways. In that case, I turn to the real world.
I've worked out at all times. I've trained clients at different times. There are different physiological things happening in the body at different times of day. Sure. BUT, and this is a big but.......
What if morning isn't conducive to an individual? Meaning, what if they are really tired in the mornings and won't get an effective workout in because of it. Would they be better served still working at a lower intensity in the morning just "because it's better?" Which can be refuted. Or would they be better picking the time of day that they are able to hit the workout, no matter what form of exercise we are talking about, the hardest.
Hint:
The latter is the winner.
I simply commented b/c I don't want noobs trying to fit exercise in the mornings in, just b/c it MIGHT be slightly "better." Working out when you feel most ready during the day will ultimately serve you better in the end