Start with Brave if you want the same sites with ads already gone. Vivaldi if you want the toolbar your way. DuckDuckGo if you want one tap to wipe the session. Firefox if you want add-ons.
Will my bookmarks move?
Not by themselves. Chrome can export them. The new browser can import them. Or leave them in Chrome and start clean.
Can I go back to Chrome?
Yes. Settings, Apps, Default apps, Browser app. Pick Chrome. Bookmarks in the other browser stay there.
Does Brave open every Chrome site?
Almost all of them. Brave is Chromium, so pages that work in Chrome work in Brave. A few sites that demand Chrome by name may still fuss.
Do I need an account?
No. Brave, Vivaldi, DuckDuckGo and Firefox all work without signing in. Sync is optional.