CPUbenchmark.net is the best way to compare 2 CPUs.
Directly comparing cores and speed is only useful across the same architecture, comparing brands and different generations should only be done via benchmarks.
I can’t provide any feedback about if those CPUs are enough for immich as I do not use it.
The company doesn’t care if you’re happy, they care that you’re going to spend money. Most people don’t have the self control to not pay attention to the hype and the delay makes people talk about the product. The delayed gratification only makes you want it more as now you have to wait and think about how you don’t have the thing that you want.