Having JS disabled is very rare for non-bot traffic, so you stand out far more. It isn’t about uniqueness, you are already unique if you aren’t using Tor/Mullvad browser(s). While disabling JS protects against certain kinds of fingerprinting, there is pure CSS and TCP fingerprinting. Firefox RFP (eg. Librewolf) and whatever Cromite or Brave have help to protect against much of JS fingerprinting. You are only ever going to fool naive scripts which these browsers already do a good job of that.
As for security, having JS disabled is a benefit. Just know since you will very likely have to enable to again quite often for random websites, you’ll become used to doing that to the point that it may as well be useless. If a random website doesn’t load just leave it, unless it is worthy of some actual trust. Even more useful would be setting up uBlock Origin with a blocking mode, such as medium or hard.


Vivaldi is also proprietary. Not a good privacy browser.