Hmm, an interesting philosophical problem that many a juvenile wrestles with on a daily basis. Here's the answer:
Girls are better than aeroplanes.
Aeroplanes are better than cars.
Cars are better than motorbikes.
Motorbikes are better than bicycles.
Bicycles are better than skateboards.
Skateboards are better than roller-skates.
Roller-skates are better than pogo-sticks.
Pogo-sticks are better than stilts.
Stilts are better than nothing.