Opinion Emergency!!!!

If the time is available either way I would decide based on who teaches physiology at what session.

I enjoyed my physiology class immensely because the teacher loved teaching. I was working 11:00pm -7:30 am but woke right up with the excitement of learning. That was a evening class.
The day class was taught by the same man who taught anatomy. He had not attended medical school, which was his dream. We nearly had to teach ourselves, this guy had no enthusiasm for teaching.

Perhaps you could ask previous students about their experience in the classes.

Also you know your schedule, sleep needs, endurance, and biorhythms.
It is difficult to advise another person.

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