99 out of 100 would tell you to buy the yak version that has no suspension. but iam not sure..
In towns and almost anywere i would prefer the ibex with the suspension. When you have 15-25kg in your trail and jumping on and of walkingbanes, dumps in the road etc the suspension must be good to have.

In my opinion if you are going rough offroad tracks. You need a one wheel with suspension.