I don't think the brand matters so much as the when you take it.
You HAVE to either put the drops on the food or chew the tablet with the VERY First mouthful. With Milk shakes I actually chew a second one. As to yogurt and Cottage Cheese I could/can eat those without the Enzyme added. They are processed enough that the diary protein is not a problem. I can also eat Kefer which is sort of a liquid yogurt without adding the enzyme. The brand I purchased first is Lactoad Fast Act. I will be getting the drops since the tablets will become a problem as I move through Radiation. Most of the Ensure or other "drinks" can be purchased Lactose Free.