brent they all more or less share the same internals
They share the same rendering engine, but as far as I can tell from what I've read, that's all that they share. I'm not concerned about security issues between my browser and my monitor screen.
And my suggestion was only to try to help you find a solution you'd like. Until you just mentioned it, I wasn't aware that you'd ever tried Vivaldi. It's mostly worked very well for me, and I wanted to share that.
I'm even considering softening my opposition to Google, at least a bit. I don't use them for web searches ... I like DuckDuckGo instead, and there's no evidence that DDG has ever re-ordered their search results based on their advertisers. They don't have any of those.
And the only reason I have a gmail account is because the company that hosts my domain (wetgeek.net) won't accept a contact email account that's within a domain they host. I have to have a different email account for them to send notifications to. Gmail seemed to be the most likely to still be in business years from now, when I need a reminder to update my account. I don't use gmail for anything else.
And Chrome is the only browser that my TV streaming host can reliably query for geolocation data. They need that in order to decide which set of local stations to send me. So I keep a copy of Chrome to use only for that purpose.
And my wife would divorce me (or worse) if she couldn't watch our local station that offers Wheel of Fortune and Jeopardy, both of which she watches every night. I've checked every other streaming service I know of, and haven't found another one that provides that local station, so I'm stuck with tv.youtube.
So, instead of totally avoiding Google, I'm now focusing more on which services they offer, and how I use those services.