Don't put editing and encoding in the same processor basket...
Editing rely primarly on fast HDD and RAM rather than on the processor while encoding is a processor job.
Which processor is best?? Both! Some task will run better on Intel, other on AMD, so at the end, it will be a close match. The codec used to encode the video file is what make the difference. Some codec run faster on AMD than Intel. Others run faster on Intel.
I tried both system and did not find any specific performance advantage over the entire project with either processor.
OTOH, dual core might help here. Intel has a cheaper dual core, but.. while it is good for multithreaded or multitasking, it is rather weak at single task. AMD dual core generally perform better, but cost more.
Main advantage here goes to AMD for cooler CPU, meaning less noise and better stability.
While editing, HDD are working harder than usual, because usually, video files are bigger than available memory. HDD get hot too, and added to the motherboard, video card and CPU heat, it can cause some instability in badly vented case.