Homogenizing has no health benefits - in fact may even bad for your health. It is a process to transform the fat in milk to tiny particles that mix in to the rest of the milk instead of rising to the top. This is to prolong shelf life since the fatty part would go rancid quickly. There is disturbing information that these particles are not digested propoerly but pass thru the stomach and intestine walls (controversy over whether this is harmful or not is ongoing).
Pastuerization is a process of heating the milk to kill bacteria and organizisms that might cause food poisoning. Unfortunately, all the valuable enzymes need for proper digestion are destroyed also.
So, to answer your question. Fresh, raw milk is healthiest and easiest to digest but it must come from a very sterile reliable source to make sure it is not contaminated. IF you do drink pasteurized milk, look for non-homoginezed and use it as yogurt which has live cultures which aid digestion.
A personal example is my brother. If he drank milk or ate cheese he would have extreme allergic reactions. When he lived on an organic farm, he had no trouble with fresh milk or any products made from it. WHen he left and had regulary dairy again - same allergic symptoms as before.
Here's one websites:www.all-organic-food.com/milk.htm
There are lots of other sites too if you do a search. Good luck.