I made some tests with Topaz.
In small details it looks a little better. When i tried to make images a little sharper and closer like Topaz they looked more eh...sharpened.
In that aspect Topaz looks a little better. At least to my eye and with these 5-6 tests.
If you like you can make tests (with other photo editors too for example) with these files (the resized ones are there too) and see it for yourself.
Curious what your opinion will be.
Just a side note. When i tried it with the small render that had low AA and detail, the result was more different then the original render.
That makes sense of course. So close the look of the original small image is to the original, so better and closer is the resized one.
So i tried with a small AA 6 rendered image instead of an AA 3 rendered small image too here.
Render time got higher of course but it was still nearly half the original size render time.
But i might have to use higher AA in the original size images too anyway after i did some tests with the animation.
So still very good if resizing works.
There is a small detail difference in Topaz. If the difference in quality is high enough to buy Topaz i am not sure.
But for that price maybe...
All are in this 44 Mb Onedrive zip file link if you want to see it for yourself.
https://1drv.ms/u/s!Ao9EyFWihNgcilDOZRCJuXHXzx-w