Go + Datastar is simpler, I much prefer it.
I would add a-h/templ for templates and it has Datastar support as well.
It is staggering how Datastar is not more popular.
Moreover, htmx can only do a fraction of what datastar does - you'd need to add on something like alpinejs to be able to try to fill the gaps. Both combined are much larger than datastar, and not nearly as integrated.
Off-course these additional tools are not free [2].
[1] Rocket for WebComponents, Stellar for CSS
[2] Nothing wrong in charging but $349 is a tad too expensive for me. I will happily pay if it was in double digits.