Not to sound "relativistic," but some of it depends on the size of the whitetail you'll be hunting.
I used to hunt Central Texas whitetail - 60-80 lbs (dressed) was average size. I wouldn't have a problem using a good 158gr on them.
I've seen pictures of some bigger deer that run closer to 200lbs on the hoof. For those Muy Grande monsters, the 180grs or maybe a 158 cast HPSWC would be more appropriate.
Take my advice for what it's worth...I gave up deer hunting in '95 after wounding a 12 point and being unable to find it. That, plus my family are not venison eaters, give me reason to "Barney Fife" deer hunt - sit in a stand with one bullet to fight off ferrel squirrels, skunks, rattlers, etc.
Q