What's more difficult: running 5 km x swimming 5 km?
... is more difficult than...
What's more expensive: gold x diamond?
... is more expensive than...
What's more old fashioned: matches x lighters?
... are more old fashioned than...
What's more important: sleeping x exercising?
... is more important than...
What's more modern: 3D printing x The Internet
... is more modern than...
