It's also cheaper...
I got that set last year, and ran into the problem that every disc had been scratched by the packaging to the point that one or more episode per disc was unplayable. I'm not sure if you would run into the same problem, but there are a lot of comments on Amazon with people who say the same thing.
I returned it and got this set instead: https://www.amazon.com/M-S-H-Complete-Movie/dp/B00BMJ7ZKG
It doesn't have as nice a box, but all of the discs actually play! And it does have the movie included.