I have yet to find a pot which pours decently, so I am reluctant to make tea in one. If we have visitors, I make a thermos of tea and leave it on the table - that keeps quite well for an hour or two. It's better if I add the milk before the water. If it's our sons staying, I know they drink it like that anyway.
Otherwise, as I'm the only one in our household who drinks what the Germans call black tea, I make it in the mug. Here again, I put the milk in before the water. That way I don't get the unsightly film on top. It tastes different every time, so a comparison with a pot-made tea would be interesting but not definitive.
Yesterday, for example, I had two cups first thing (one at home, one in the office) which were both delicious. This morning, exactly the same tea made the same way tasted "meh". Go - as they say - figure!