ILF said it best. If you want pure throw, go for the M3X. I have measured my lights and M3X is really good. Its quality is good as well, definitely no issue with the anodising and the threads are just a little bit rougher than the usual Jetbeams/Fenix. Even in pretty rough use (enough to scratch up the HA) i don't think anybody can break a M3X, to be honest....unless you forsee it being dropped in a cave past 10m down. If you enjoy "visual toughness" and that "heft in hand feel", then the Catapult V3 would impress you, because the walls are way thicker. It throws a wee bit less. By lux values it is about 15% less, so the difference is mildly visible in the real world but only in a side-by-side direct compario. That 15% in lux difference only means 214m and 197m in physical distance for the M3X and Catapult V3 in the real world, using the international searchlight lighting distance standard 1 lux at target.