However, everything else being equal, i.e., there are two containers of milk in front of you; one is cholov yisroel and one is cholav stam, Rav Moshe suggested that you go lifnei m’shuras hadin and drink the cholav yisroel. But if the chalav stam is freash and the cholav yisroel is not, or the cholav yisroel is finished, he permitted to drink the cholav stam…l’chatchila.
Serious question on this. You are at a table and there is a container of Mehadrin Ice Cream and a container of Haagen Daze. According to this Shee-ta which should you eat