I’ve worked for both over the years. Small companies have their own downsides. There is no clear winner. People complain all the time, so if you have never worked at a large company you have no clue what it is really like. Sure there are things not to like, but there are also things to like.
Easy to say if your code doesn’t matter. If you work for regulated industries (FAA, FDA) you can’t ship it out the door.
I have been working on automating our tests for years. Manual testing still finds a lot of things despite passing all the automated tests. I’m now convinced anyone who says “automate that” doesn’t care about quality, humans are too good at finding things.