Cartridge stuff tends to have better seals, but once a cartridge BB or headset wears out, there's no servicing it. It comes down to how much you want to maintain and adjust versus replacing parts, and I have to admit that I'm agnostic on bottom brackets these days. After one particular loose-ball BB kept having the telltale sound of a piece of grit after repacking it (despite my best efforts to keep everything clean), it was quite the relief to replace it with a cartridge unit.