I've had a guitar with emg 81 and emty blackout, only the neck model of the emty set is alnico, iirc bridge is ceramic. 81 is definitely tighter, emty feels higher output with more bass, still tight but not as tight as 81. My other guitarist has AMs, they're crazy tight. Emerald BKP deserves an honourable mention, a different voice from most other pickups mentioned but plenty tight.