Well, the answer from me is that I don't know but some seem more trustworthy than others. apkmirror has a known team behind while e.g. apkpure does not. According to this comparison, apkpure has had malware included, and no one knows who's behind the site: https://www.slant.co/versus/7899/22173/~apkmirror_vs_apkpure
So if choosing between these two, https://apkmirror.com seems the better option. If it's good enough, no idea.