It's probably best to avoid dairy if you feel it has nothing to offer you that you can't get from other foods and if you're not prepared to conduct strict experiments with different types of dairy.

The consensus is that A2 and organic grass-fed dairy are the most healthy.

Be aware that dairy can amplify autoimmune problems for which it's not a root cause. If that's the case for you, eliminating the root causes can allow you to enjoy many forms of dairy without negative effects, and with all the positives.