(not the parent poster, but same setup): Is it better than UI Protect? No, but you can make it about the same.

I have the same popular setup (Frigate) although I just use ONNX on an 11th-gen Intel CPU instead of a Coral (unless you are trying to do something fundamentally goofy like use a Raspberry Pi as an NVR, Coral doesn't really perform better than even a several-generations-old iGPU or iNPU).

This is the typical OSS story: you can duct tape a giant leaning tower of janky stuff (Frigate + go2rtc + HomeAssistant + various connectors + some kind of VPN/proxy solution for away-from-home access) together and get something that's fairly close to the commercial solution, where you click a button. The open source solution is fun and more customizable in highly niche ways (you can bring your own image recognition models and tagging, adjust the resolution and encoding for everything in infinite detail, and so on) and the commercial solution is easy and works. Chose your path.

I will say I've liked the Frigate stack, though. I'm making some recognition tweaks for recognizing animals on my property, the software works well enough, and I do like having a really, truly on-prem solution for this specific thing.