I would venture my results for seeing whitetail are about the same between both evening and morning.
As far as taking a whitetail.. pretty even as well.. maybe a slight (very slight) edge to morning.
But I'd say overall 50/50.
I agree with this post, for me.
Of the 5 bucks I've shot.....3 were evening.....2 were morning. The best 2 were shot in the morning......about 40 yds apart.....two consecutive years.
Until I found a really good morning spot, my sightings were likely 90/10 in favor of evenings. Yeah....my bestmorning spot is THAT good.