Unfortunately the world of DVD and Blu-ray seems to be overrun with too many editions. For example besides that particular HIMYM set (here it is at Amazon [1]), there is also this one [2] which is $49.99.
The pictures for the two look identical. But the release date listed for the $32.99 is about 9 months later, and the media format descriptions differ between the two. The $32.99 one says Subtitled, NTSC. The $49.99 one says NTSC, Widescreen, Box set, Subtitles, AC-3, Dolby. The $32.99 lists language as "English (Dolby Surround)" so does apparently have Dolby. The $49.99 one doesn't list language. The $32.99 one says it has English, French, and Spanish subtitles. The $49.99 just says French and Spanish subtitles. Does one of them have better sound? Do either of them have commentary, deleted scenes, or other special features. Does only the $49.99 have widescreen?
Some comments mention that there is commentary, but (1) Amazon considers these two sets to be variations on the same set and so they share comments, so there is no way to tell which set the comment is talking about, and (2) some of those comments are from several years before either set was released--they were definitely commenting about HIMYM so my guess is that they were for early releases of specific seasons or something like that.
If I were interested in buying that complete HIMYM I'd have no idea from those Amazon listings and comments which set to buy.
I've also seen similar things when considering buying movies. There will often be one or more of a DVD, a DVD + digital code, a Blu-ray + DVD + digital code, a 4K UHD Blu-ray, a 4K UHD Blu-ray + digital code, a 4K UHD Blu-ray + DVD + digital code, and probably some that I've forgotten.
Online listings often don't say if the digital code is for 4K, and often don't say much about special features. It is confusing enough that my impulse to buy the movie does not last long enough for me to figure out which to buy.
[1] https://www.amazon.com/How-Met-Your-Mother-Complete/dp/B07GJ...
[2] https://www.amazon.com/How-Met-Your-Mother-Complete/dp/B0747...