The sampling rate of your recording is dependent on the sampling frequencies permitted by you input equipment(webcam etc.), and the frames you can display is governed by your video card(s) and audio out chipset. To be quite frank anything over 30 FPS appears fluent, so unless you want people to replay very specific sequences in slow motion and have good detail during slow motion replay I would opt for lowest frame rate that does the job adequately. This could be to your advantage if you want to stream this from a web server so that you can support more traffic on your current bandwidth.