Eating at a lower trophic level reduces your energy consumption and therefore your pollution output. If you are able to do that with foods that are close to the general macro and vitamin content of a burger, and it tastes about as good (or identical, as I see at times), then shouldn't it be an ethical imperative, given what we know today about climate change?
I mean, I know that humanity will survive climate change, I have every hope & belief, but the earlier that we work on it, both individually and collectively, the better off we'll be. This whole thing about "individual health" is just more tragedy of the commons, especially when the quality of health of the food is so similar - both will get you equally obese.
If we are talking about health and human welfare, there exists a lot of lower hanging fruit than concern about the miniscule differences between beyond meat and that which comes from cattle, but the ecological arguments that can be made are undeniable - impossible and beyond blow beef out of the water.