Seasonic is quieter, but the Liberty is a better PSU (modular, more cables, stabler rails, higher CFM fan) If it's a htpc go for seasonic, desktop/gaming PC - liberty. You're not going to notice liberty soft purr over the speakers, let alone the other case/gfx/mobo/cpu fans. One in my sig has even noise from each fan, can't pick out any loud fans now (still noisy compared to htpc but it's different system)