Depends on what codec you plan on using for rendering.http://www.anandtech.com/bench/Product/697?vs=551
If you are talking about DivX, then Intel gives better performance. Using the x.264 codec the i7-3770k performs better on the 1st pass, but the FX-8350 performances better on the 2nd pass. For WMV formats, Intel gives better performance.
I generally prefer Intel CPUs because they have overall better performance and consumes less power. However, they do cost a bit more. I believe under intensive CPU tasks (like video encoding) the FX consumes around 90w - 100w more power.