Avermedia - 1920 x 1080 at 30 FPS 60 megabit - H264 encoder for compression - MP4 or .ts format - HDMI and 3.5 mm jack pass through - Minimum requirement dual CPU processor with 4 GB RAM - Can be used to stream live to Twitch - Features not present: scene selection, overlay, webcam, and program hiding
Shadowplay - 2560 x 1600 at 60 FPS 50 megabit - H264 encoder for compression - Only MP4 format - Video card encoder does the heavy lifting with a performance hit of less than 5% - Records up to last 20 minutes of gameplay
Comparison - Both great video quality with minimal impact of game performance - For higher quality/reliability, Avermedia maybe your choice - Using OBS with straight H264 encoding provides smoother streaming - Record to a dedicated drive preferably an SSD