There's been plenty of research on this and Standard ("Winter") Time is best for humans. A peer-reviewed paper with plenty of footnotes if you want to dig into the details / weeds:
> Conclusion
> In summary, the scientific literature strongly argues against the switching between DST and Standard Time and even more so against adopting DST permanently. The latter would exaggerate all the effects described above beyond the simple extension of DST from approximately 8 months/year to 12 months/year (depending on country) since body clocks are generally even later during winter than during the long photoperiods of summer (with DST) (Kantermann et al., 2007; Hadlow et al., 2014, 2018; Hashizaki et al., 2018). Perennial DST increases SJL prevalence even more, as described above.
[…]
> Summary
> Discrepancies and misalignments between social (local) clock time, sun clock time, and body clock time can be caused by political decisions: DST is one example. There are multiple health and safety consequences of these misalignments. Our goal is that this article’s facts and reasoning will be used to make clock choices that improve human lives.
* https://www.frontiersin.org/articles/10.3389/fphys.2019.0094...
They explicitly state that always-DST is worse than the current switching regime.
Various societies of chronobiologists recommend getting rid of DST completely:
> The authors take the position that, based on comparisons of large populations living in DST or ST or on western versus eastern edges of time zones, the advantages of permanent ST outweigh switching to DST annually or permanently. Four peer reviewers provided expert critiques of the initial submission, and the SRBR Executive Board approved the revised manuscript as a Position Paper to help educate the public in their evaluation of current legislative actions to end DST.
* http://www.chronobiology.ch/wp-content/uploads/2019/08/JBR-D...
* https://srbr.org/advocacy/daylight-saving-time-presskit/
* https://esrs.eu/wp-content/uploads/2019/03/To_the_EU_Commiss...
* https://old.reddit.com/r/askscience/comments/dq2nv3/askscien...
* https://en.wikipedia.org/wiki/Chronobiology
If we're going to go through the drama of making this change (and some of us had to live through the 'Bush' DST change), then biologically speaking, the best current research says Standard Time is the way to go.