I was using brave before and decided to switch to firefox but I did some research and turns out firefox collects way more by default than brave and I am switching back, what do you think?
Untill we get a gecko webview , you are using chromium based , whatever browser you are using. So yea the options are or use chromium or chromium plus Firefox.
I don't know how it stacks up but there's also DuckDuckGo's browser - it has the added benefit of 'App Tracking Protection' which stops other apps from collecting data in the background by using a local VPN. Crazy how much it blocks - even for apps that haven't been launched at all recently.
Firefox has specific issues that chromium based browsers don't. A big one is site isolation or keeping one website from accessing data from another. Those problems are worse on Android than desktop. I do use Firefox with uBlock on desktop but Brave on my phone.