ive used both on the rear of my bike. 150/60 size.

front using S123 110/70.

both are good but i much prefer the S123. i feel more confident riding in the rain with it. so this is the tire id recommend.

S123 did about 18k km before i changed.
Sportec street currently at 5k km.

but im planning to change the front to sportec street also...just to try it out and see what it feels like to have both front and rear sportect street.

after that may end up back to S123.