What setting will allow me to rip a blu-ray surround sound (using imElfin Blu-ray Ripper). I.e. 5.1 channels or 6 channels?

i am cannot decide between 720 and 1080. i sit at a desk watching my movies on the pc and my screen is on another desk directly in front of me connected to 5.1 surround speakers. It's a 24" screen.
With the 720 and 1080 p video make any difference on my display?