More cores is probably better, even though the super awesome multi-core rendering tech isn't going to be in 12.0 yet. But it's on the horizon, so if you buy hardware today, buy yourself something that you can be happy with tomorrow as well. The big engine re-architecture is planned as one of the big features to come in one of the first major v12 updates, we got a pretty good idea of what we want to do here and a lot of the tech already exists. That being said, 12.0 itself doesn't make any big major leaps here in terms of CPU core usage, so you are still quite well off with a CPU that can do well in single core benchmarks.
