I am certain a 250 hour CFI is better than a 150 hour LS CFI
Better at what? Not at teaching how to fly a nimble LSA with a minimal panel when all he knows is the truck like handling of a PA-28 or C-172 with a glass panel.
But we're not talking about 150 hour SP-CFIs, we're talking about experienced pilots (PP or SP) with lots of years and hours who decide to earn a SP-CFI later in life.