I have a somewhat older PC (Sabertooth motherboard, I5-3570K CPU @ 3.40GHz & Nvidia GeForce GTX 670FTW. Which do you think is better to use for screen recording, the CPU or Nvidia NVENC? It's my only two video options, other than MP4.
I'd go with Nvidia NVENC for screen recording. It puts less strain on your CPU and usually gives better performance for recording. Plus, it's built for video encoding, so it should do a solid job with your GeForce GTX 670FTW.
I'd go with Nvidia NVENC for screen recording on your setup. It puts less strain on your CPU, so you can keep your PC running smoothly while capturing video. Plus, it generally gives good video quality.