which tire for my Trek T900?
 

if you are to decide based on specification, which tire would you choose?
definitely not for racing use. mostly day tour and fitness ride.

tire A
26x1.3 slick, 66tpi, 72psi max
60a duro thermo silica
680grams (puncture resistance system)
wire bead

tire B
26x1.25 slick, 60tpi, 100psi max
70a durable long wearing compound
probably less than 500grams (basic puncture protection only)
wire bead

i hope you guys don't mind the 'blind test', maybe you can try to guess the tire.

thanks in advance!

There is so little difference between those tires that it hardly matters.

FWIW I would go with the one rated for higher psi.