Thank you for your reply Boo Berry! Have a great weekend!Browser Assistant is my pick, because since it's a browser extension it isn't injected into websites like other userscripts are. And it'll work on all websites, unlike the legacy Assistant which doesn't work on some pages (e.g. Wikipedia).
Finally, the native Browser Assistant extension will help solve the service worker issue.
Thank you, Boo Berry!!! I really appreciate your taking the time to further explain the differences so I could get a better understanding of why the Browser Assitant is the way to go.
For about a week I used only the Browser Assitant and disabled my Chrome and Mozilla Browser extensions; then about two days ago I noticed the Browser Assitant icon in my Chrome Browser was greyed out on my home page and when I clicked on my assistant icon it said "AdGuard is not installed or configured incorrectly" but it does work fine when I go to or open up any webpage and so I guess it's just on new tabs or that blank Google home page where it's not loading. But I still feel just a little bit more secure with my Chrome and Mozilla Adguard Adblock Beta and standalone Extensions enabled. (like when I see the Adguard Adblock Extension icon turn blue in integration mode I know that everything is working correctly and I'm secure).
So I'm seriously thinking about Re-enabling my Adguard Adblock Beta Extension (at least) in my Chrome Browser and experimenting the next week on which works better for me; or which one I like better.
If running both the extension and assistant at the same time is okay (and not cancelling out or hindering each other) I will also continue to try this out. And thanks again Boo Berry for your corteous and knowledgeable reply and all your patience explaining and then re-explaining this even further, so I could hopefully understand... With my very best regards to you and everybody working hard over there at Adguard.