It's what ever looks best to you. My LG, an older model can output 24p so that's how I have it setup for blu-rays. For 120Hz, you're going to be enabling TruMotion which will give it that SOE if that's what you like. I never use TruMotion when watching a blu-ray and only occasionally use TruMotion for television. I'm sort of a purist so I want to watch a blu-ray movie with the least amount of artificial processing going on that I can, hence 24p with TruMotion disabled.