Powerlifting and mass

So I hear that powerlifters will often work a major compound lift like Bench Press twice a week. First day heavy, next day lighter and faster. How does this compare with going heavy with One or Two muscle groups each day (example: MON Calves and Core, Tues: Chest, Wed Quads and Hams, Thursday Biceps Triceps, Friday Forearms and Core, Saturday Back, Sunday Shoulders) so that overall each muscle group is hit heavy but only hit once a week? Does the answer change if one set of every exercise in the second method is a fast warmup to failure with lighter weight (i.e. getting the benefits of both?)? Is one better for mass and the other for strength or something else?

Powerlifting and mass