Neither can be trusted, nor is it a good practice to use them. That is simply because neither of them is free software
. Basically, it means that the code cannot be studied, so they cannot be trusted, and they restrict the user's freedom, so they are not very ethical, either.
First of all, let me say that Chrome is also non-free software, and it is known to spy on it's users (Which is not surprising, seeing as it belongs to Google). The only popular free browser is Mozilla Firefox
, so you might want to use that. If not, you can try others, like Midori
. And, of course, for about the best privacy you can get, use Tor Browser
. But Firefox with some add-ons should do for ordinary browsing.
If you need a password manager, you can try KeePass.
If you want to browse safely, you should check out Disconnect
, Privacy Badger
, HTTPS Everywhere
I got the info about add-ons from Prism Break
. It's a website listing many good alternatives to non-free and dangerous software. It's not perfect, but you can find some nice things there.
I hope my comment was able to help you.
Stay free, stay safe.