In fact the big software companies usually have better security (google included) because they have some of the world’s best security people.
I try to avoid companies that have an incentive to collect user information for ad targeting. Apple doesn’t have that (and they’ve also made privacy a brand thing now so they’re even better than average).
Gmail was great when it came out, but today it’s a pretty mediocre product. Fastmail is actually better and I don’t say that as someone making excuses for non-google services. Their docs and custom domain support are really great. Their support for aliases is also great. They have good fancy workflow options I just don’t need so I don’t use.
DDG was worse for a long time, but for the last year or so it’s become good enough for me to make default. I occasionally g! to run a google query, but that’s probably only 10% of the time (and of those only half are probably actually good).