You're not giving up a lot with the Trail as compared to the Thermion. I like how the Thermion mounts and like the controls better but battery life is a big downside. You'll get much more run time afield with the Trail. The only zero shift that I've seen in the Trail is related to updates. They do seem to be a little affected by temp so I wonder if guys that have wandering zero problems are sighting in during the summer and then seeing it change during winter? I dunno.
How long is the battery life on the Thermion? I read the article in the (AR Dope Bag, May 2020) about the XM38 and they say that the battery life is reasonable and practical ( for who ??) keep those advertising bucks coming in.