You are comparing different sorts of tyres. One is treaded, quite a thick one, and is designed for durability. The other is more a performance tyres that is designed to roll fast, with no tread.

I use both. I have Marathons on my touring bike at present. I've had them for a while, and they are heavy, as suggested by another poster. The Duranos we have on the tandem, and which we toured with around the world last year are much lighter and do roll better.

I like both for the jobs they are designed to do, and that is the key.

So far, the Duranos on the tandem were replaced after about 3,000km of road and some gravel riding, but I take a very conservative approach to this because it is the tandem; they had enough wear in the rear one for me to put them on my old Fuji Touring for pottering about.

The ones on our touring bikes have done over 3,200km (2000 miles), but have been swapped out recently for the Marathons because of the unsealed rail-trail rides we have been doing lately. There is still plenty of wear -- at least 500km -- left in the Duranos.

Lighter weight tyres aren't going to last as long as heavyweights. I think 2000 miles may be ballpark for the Duranos.