Even with the alleged missing frames I found Thz.la to be the best release group overall. (1) vid quality is very good, (I am not in a habit to view JAV frame by frame, usually my hands are busy), (2) file size are very reasonable, (3) they release everything that I care about, actually they release much much more, but what matters is that the vids I want are almost 100% guaranteed covered by them, if sometimes there's a 5-15 days wait. NO more anxiety of wondering if a good watermarkless rip (well actually anything but the yellow watermark was OK by me) would ever be released for any particular anticipated vid. And less anxiety means more erection. (4) there's a good place to get the "official" torrent, no fuzzing and guessing which torrents are which release group or wondering if a website (nyaa.si) is missing a release.
My pre-thz.la habit was to always try to find a source with accompanying screens to check for various issues, watermarks mostly but there are other more infuriating flaws, e.g. incomplete rips (missing second part of a 2-disc vid), or even the wrong vids. But some uploaders even circumvent my caution by uploading a watermarkless screens to accompany a watermarked vid. With Thz.la, no need, they are consistent and reliable. You know what you will get from them. If there are really missing frames or less than perfect rerecording they don't interfere with my enjoying.
Even if there's an unflawed vid somewhere out there (cue The X-Files music), I'd rather save the minutes and hours of searching and downloading multiple copies and comparing side by side frame by frame to find the perfect version, I'd rather grab the one reliable release. I have only so little time devoted to JAV per wk, I'd rather spend more of that time watching and fapping.
If there's another group with the above positives and no "skipping frames" I'd gladly switch.