My commute is 25 miles each way, 50% on road 50% bridleway, rough farm track, towpath, broken road.
Been using Schwalbe Marathon Greenguard 35mm on my Kaffenback. They’ve been really tough, no ahem….”thingies”…… in 10 months of twice a week commutes.
But they are heavy and draggy. I’ve been running them on Mavic A119 rims. I would consider 32mm or even 28mm. A bit sketchier on the pebbly/gravelly bits, but faster on the smooth.
I have tried Continental Grand Prix 4 Seasons, they were definitely faster, took 10 minutes off the commute, but started to suffer pinch flats (see one of my previous posts). They clearly didn’t suit the wider rim of the A119.
I’m now building up some Mavic Open Pro rims (15mm wide) to run the GP4Ss and see how that goes.
So, Marathon Greenguard totally reliable but a touch heavy. GP4S is an ongoing experiment.
Your choice might depend on your rim width (ooer missis).