Which is more important for editing, CPU or GPU?

I know this is an older post but thought I would shed a little light on some things to consider.  I was looking for an answer to a different question.  So are all Ghtz the same - nope!  You cannot compare a processor running at 3 Ghtz in generation 5 vs generation 8.  Why is that?  Well there are a number of factors, later processors can have more and faster cache memory so faster to the next step.  The internal coding (what use to be called microcode) can be improved so that multiple procedures can be executed in a single cycle, denser circuits mean shorter distance for signals to travel (yes it is a short time but there are difference - see 3D memory), busses get bigger - you get the idea.

In this case, both CPU and GPU are almost equally important. You see, you chose two outdated, old-generation CPUs with woefully inadequate integrated graphics processors that actually make even an 18-core, 36-thread CPU excruciatingly sluggish. And if your choices are laptop (rather than desktop) configurations, beware that all Haswell-generation mobile i5s, as well as some mobile i7s of any generation up to and including Kaby Lake, are only dual-core CPUs. And no dual-core CPU, even with hyperthreading, is as powerful as even a mediocre same-generation quad-core CPU, let alone a high-end CPU.

Have you considered some of the new AMD Ryzen CPU's you will get more CPU horsepower per dollar   What is your ballpark price range?

Also, this will help:

FAQ: How do I speed up rendering, exporting, or encoding?

Faster CPUs with more cores are better than GPUs. Multiple CPUs — even better. Video encoding and editing is a CPU intensive process. That being said, having a good GPU will aid in encoding GPU accelerated effects.