They all suck.
Most of the 'Streamers I've been flying with have started moving into their base - there's anywhere from 6 to 10 "jumpseaters" (NWA, MSA and PCL combined) on just about every flight to or from MIA, FLL, or PBI and 98% load factors which means some are burning passes and others are getting bumped.
Seem to be the most GIA people in DTW, 2nd is MSP. MEM has less MIA people, but fewer flights too, or at least that's what I've been told.