Let me be very clear: I like Askama and have submitted pull requests to the project in the past. For a new project where I need templates, I value the speed of reflected changes over compiling more stuff into the binary.

There are also certain classes of problems with Askama that you can avoid with something like Tera - e.g, with Askama, if your global layout relies on a value passed in to the rendering context, you'll need to shove that value on every Template struct.

Furthermore, most people will hit bottlenecks in other areas of their application long before templating becomes the issue (i.e, this was the same in Django-land too - templating via cached compiled Django or Jinja2 templates is almost never an issue). Askama is overkill until you need it.

My recommendation, having built projects with both, is thus: build with Tera initially, and swap out hot paths to Askama down the road as they both use the same syntax (roughly) so it's not too difficult to convert one to the other.

In a perfect world the projects would be merged, and you can use the Tera aspect in dev and get Askama in production for free... but that's easier said than done.