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what program will you be using?
Only ask as some are optimised of use on either nvidia or amd
Both the programs you listed dont need a specifically powerful gpu.
NEW! Multi-GPGPU Acceleration
TrueVelocity® 3 now supports multi-GPGPU so you can maximize performance from multi-graphic cards installed and optimize editing, rendering and effect processing speeds.
Native 64-bit Support
PowerDirector is the world's first native 64-bit consumer video editing software to offer improved system efficiency and faster loading of HD video footage.
SVRT 3
Intelligent Smart Video Rendering Technology (SVRT) analyzes an entire project, then selects the best output profile for optimal production speed.
OpenCL Support
OpenCL is the latest technology utilizing the power of your system’s GPU and CPU power to boost the speed of the editing process.
NEW! Hardware Optimization
PowerDirector 11 is optimized for new generation hardware from Intel 3rd Generation Core technology and AMD 2nd Generation APU technology.