Wow that arrived quick! Fairly recent you wrote about which to get
Anyhoot;
I personally use Final Cut Pro and love it, but that's quite a bit away from free, hehe.
I would say your best option is DaVinci Resolve. It does have a Studio version which costs money, but likewise it has a completely free version, which offers a tremendous selection of features, especially for a free product.
It's made by Black Magic, the people behind the Black Magic Cinema Camera. They have excellent working relations with Apple for optimising their software on macOS, and it is also available on Windows and Linux so if you want to use the same software everywhere, you can.
Further adding merit to the software it's used by colourists in Hollywood - DaVinci Resolve started life as just a colourist's tool, but is now a combined NLE, Colouring tool and DAW (Digital Audio Workstation).
However, do read the restrictions with using the free version over the paid version; Aside from some limitations in the software, there are also some licensing differences I believe, so that if you're making a Hollywood blockbuster you can't just use the free version even if you don't use any of the extra features from the paid version.
Aside from that, KDEnlive is quite beloved in the free open source software sphere, and is probably the highest quality open source NLE, but I've never really been a fan. It's also built for Linux so while you can get it running on macOS it's a bit of a faff.
I've heard good things about HitFilm, OpenShot and Lightworks but I've only used Lightworks minimally, and neither of the other two. My understanding is that HitFilm is more for vfx work though. They are however all free so you can try them out and see what you think.
In my humble opinion however, nothing beats working with Final Cut