Asked by @ajsnonsense: Should I use Norton or move to Defender?

This is one of those questions that can be answered in an edgy way historically 1, turns out to be simple in practice 2, and at broad scale is very complex 3.

1.) Those out of practice will tell you Defender sucks. But it doesn't anymore. Ignore them.
2.) Those talking practically will say absolutely use Defender. Make sure you're on the latest Windows build with Tamper protection enabled and your "Win10 privacy tool" didn't unknowingly disable half the protection features through ignorant choices, and you have a super-powerful solution for free. And they are right. That's what I do.
3.) Defender for home users is great, but intractably could do more because it is cuffed by the requirements it work perfectly without much user input across a billion devices, and that attackers will always test against it even if it can adapt quickly via cloud. [I AM TALKING CONSUMER ONLY THIS DOES NOT APPLY TO DEFENDER ATP OR CUSTOMIZED ENTERPRISE STUFF LIKE ASR GROUP POLICY]
Some third-party vendors have their own very novel and more noisy approaches to try to differentiate themselves from this free offering. I won't get in that here.

tl;dr I would not use anything bundled in a computer, I use Defender, but also do not discount unique approaches others can bring to the table – and if you make an informed choice, I support that.

This is the kind of thing you can't say in 280 characters.