Just got done comparing the 45-130T stainless set to the 45-125 nickel set. My $0.02:
Stainless strings fall into roughly 3 categories for me. The stiff and crazy brights (d'addario, dean markley, DR lo riders), the pure shiny and focussed (DR hi beams), and the midrangey/edgy/woody (rotosound, labella). I'd say the foderas are in the 3rd camp but are pretty unique, tons of rich and detailed mids, not overly extended top but tons of "presence". The bring out a very woody tone and the B string is great, plays solid and true up to the 7th fret on my bass. These make my ES5 feel and sound like a cross between an upright bass and a grand piano, just a massive meaty organic tone, especially on the neck pickup.
The nickels are way way more relaxed and supportive, with big buttery lows and low mids, not much upper midrange, and some nice sheen on top. Significantly more flexible than the steels and also smoother surface texture makes them play ultra smooth. The 125B is awesome, might actually sound even better than the steel 130T, and it plays solid and true up to the 6th fret, which is all I need. These make the ES5 present closer to a classic electric bass sound, still with its own voice obviously.
Sort version the steels say "bAp" and the nickels say "bah". Great strings.