Pretty minor differences between JFK/BOS 190/320 for junior lineholders, but drastic difference between what it takes to be bidding 50% among lineholders in base/equip. If quality of life is important then the E190 might be the best way to go.

[March 2015 bid award data]

BOS E90 FO
50% lineholder #~2330
Junior lineholder #2654
Junior pilot #2939

BOS 320 FO
50% #~1980
Jr line #2786
Jr pilot #2932

JFK E90 FO
50% #~2400
Jr line #2708
Jr pilot #2940

JFK 320 FO
50% #~2040
Jr line #2763
Jr pilot #2937

MCO E90 FO
50% #~1850
Jr line #2280
Jr Pilot #2455

MCO 320 FO
50% #~1650
Jr line #2155
Jr pilot #2340

FLL 320 FO
50% #~1950
Jr line #2670
Jr pilot #2780

LGB 320 FO
50% #~1530
Jr line #2484
Jr pilot #2871