That's not a fair comparison, considering that price per core usually goes up the more cores there are. Also, if you check pcpartpicker you'll see all the i9s with greater than 12 cores are either sold out, or well above their MRSP.
I ended up going with a Ryzen 9 though & it's been flawless so far. Great performance. Wouldn't look at an Intel anytime in the near future for a CPU.
1. Really bad VM support. No Hypervisor framwork, which means problems with Docker (apparently some workarounds for Docker specifically, but not 100% stable). Things like Parallels Desktop, Android VMs, etc won't work.
2. Problems with Adobe suite apps crashing on boot. Some patches exist but last I checked there was nothing for Lightroom (which I use a lot).
3. Things like iMessage, Facetime, Siri, etc won't work
4. Uses a custom kernel and there can be hassles related to power management.
etc.
My use case would have lots of problems, but it's definitely a great option for people who don't need VMs or Adobe.