Problem: Ian usually wore contact lenses, whereas Steven stuck to wearing glasses, because

My choice: Steven had astygmatism.

Problem: My friend took the ski but I took the snowboard since the

My choice: ski looked rather shaky.

Problem: Robert was very diligent about keeping a schedule but Joseph was not.

My choice: Robert was always on time.

Problem: Peter needed to do consistent work and was able to use the wrench but replaced the screwdriver because the

My choice:
wrench was durable.