Generally, while I'm driving down the road...
A few years back I read an article somewhere extolling the virtues of identifying your hunting turf as either a morning or evening spot. The author largely based this on food sources/availability as well as cover& prevailing winds. As I paid attention in the field to the author's premise it actually did seem that of the two farms I was hunting in the same small valley, one was an a.m. & one a p.m. spot. One grew corn & hay, the other hay only; exposure was different also.
Now, I've always preferred the p.m. watch as I can hunt my way in, move more quietly while taking fewer branches to the eye and, honestly, sleep later. However, barring a storm, my "backyard" turf, 30 acres or so behind me, usually sees heavy deer movement in the a.m. while afternoons are dry.