On a smooth surface the best traction and lowest rolling resistance is had from smooth tires. On an uneven or soft surface, like mud and sand a treaded tire offers the best traction, and the poor rolling characteristics is a trade of you have to live with.
The mountain buggy pushchair has several advantages over a normal buggy. They are normally more sturdy and can withhold being used on rougher terain than the normal buggys.
I don't think soccer is rougher than ICE hockey, but i think it is rougher than in-line hockey.
Rougher and roughest
no
rougher
tougher
no
Rougher
because it is
smoother
rougher, roughest
Yes, the rougher the better!