I'm not sure its as simple as that. I personally use D'addarios but if you switch over to EB slinkys with the same gauge, bending gets a lot more easier.
A possible variable you may have neglected might be that 'Steel' and 'Stainless Steel' are alloys with variable compositions. Being a mech engineer, I was fortunate to learn about how minute differences in composition greatly affects physical properties of alloys. Many times, you can change these properties even by manufacturing processes like annealing, rolling etc.
Btw, careful with the ProSteels that someone recommended. They may be bright and chime-y but eat through frets too.
-- My current rig
Guitar: '98 MIJ Ibanez RG520 QS w EMG 81/60
Amp: Laney LC15R Tube, Fernandes 20W SS
Pedals: MI Audio Tube Zone Overdrive, Boss OD3, CS3, MT2, HM2, DS2, CE5, DD7, TU3, Beta Aivin DD2 Delay, Dunlop Crybaby 95Q, Stranger Vol Pedal, BBE SupaCharger
Others: Yamaha RBX 374 Bass, Yamaha MM-6 Synth, M-Audio Fast Track, Shure SM-57, Heet Sound E-Bow Plus
Wanted(pm if selling): EB VPJr/Boss FV500L,Ibanez w Original/Lo-Pro Edge