Well, as a former VCR repair tech, I can tell you why we thought VHS beat BetaMax: the VHS machines were much easier to repair.
A friend who worked at VMI in Sunnyvale back in the days said same thing. He worked on reel to reel, and interacted with other guys who worked on VHS and Beta. To align the beta heads, the machine had to be shipped to Japan as it was that precise.
I also heard there is a documentary about the guys who developed VHS, a Japanese show where they portray these as a drama. I'd love to see it as another friend while he was in Japan he watched this docudrama. These guys went on for days, weeks, months with very little time to sleep, take baths, or eat. Entire lab was filled with huge rack mount test equipment, scopes, etc. with cables and cords going everywhere, and floor covered with empty food containers. One of the guys was given an impossible task during the project which he was seriously considering an easy out (stabbing himself to death like a Samurai). Other tasks included hundreds of insert-and-eject tasks to ensure the decks will not eat tapes. When they finally got it going, Sony and other companies rejected it. But JVC accepted it and also provided licensing for other companies to make VHS machines.
Anyway, I am old enough to remember when video cassettes arrived on the consumer market. I didn't have enough money to buy a machine so I rented. VHS was a no-brainer because I can record a 2-hour movie or two 1-hour TV shows. Or put it in EP mode and record three 2-hour movies. Beta was maximum 90 minutes which even though I heard it was better (honestly I couldn't tell the difference) but I need that last 30 minutes!!!
But wait, this guy lead a team to develop the first consumer video cassette deck, https://www.youtube.com/watch?... Richard Elkus knew even in 1960s video will never be popular in the consumer market unless it was a cassette. i.e. people had 8mm film but they typically only watch it once because setting up a screen, setting up and feeding the film through a projector was too tedious for most people. Unfortunately US companies didn't buy into it but the Japanese took the technology and ran with it. Rest is history.
Getting back to Beta, that was the game changer for news media. None of the "film at 11!" as that is how long it takes to develop and show 16mm film footage of an event earlier in the day. None of packing a camera with a separate recorder and wearing a 50 lb battery belt. Grab that shoulder mount, run and gun, for action reality footage, and also be able to solve the camera in a politician's face, and footage is ready to go for the 6 pm news.