My tests.
From my point of view, the latest Autoremesher gives very good results, but even with the Low option, the mesh is a bit dense, has some holes and some poorly defined corners. Quadremesh concentrates the mesh better in the corners and the flow is somewhat better.
Anyway Autoremesh is the best remesh Open Source option by far. We will have to wait for the final version so that at least the holes disappear.
I share the test file. The original model, with subdivisions applied, I did it manually and it was torture. You can do tests with it if you wish.