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Firefox also has password/history/bookmarks sync between devices.

I've always wondered how Chrome and Firefox password storage fare in safety. Are they both equality trustworthy? Are the encryption technologies comparable?

You can read about Firefox Sync here: https://hacks.mozilla.org/2018/11/firefox-sync-privacy/. It is also possible for you to run your own sync and account servers: https://mozilla-services.readthedocs.io/en/latest/.

I assume that Chrome has a similar design, but I'm not familiar with it.

auto-fill of CC/billing information is the feature I wish FF had.

I use the BitWarden Firefox extension for this.

Firefox has this in nightly too (possibly only in US). It's been there a while and works well, I don't know why it hasn't moved on from nightly, to be honest...

I've been using 1Password for years now, and it has extensions for both browsers. Now I'm portable and not locked into a single browser. I had a friend nag me for a long time because I was too lazy to try it out. Once I did, I have never regretted it.

Use an extension instead. It's more portable, you have control over it, and don't have to feed Google more data.