Wheels: 2 Wheel vs 4 Wheel
It is worth considering your needs and requirements when choosing between a 2 wheeled or 4 wheeled case.
A 2 wheeled suitcase has to be pulled behind you, which tends to be easier if wheeling on rougher or uneven surfaces. 2 wheeled cases are good for those on a tighter budget and are usually lighter and offer more internal capacity than a 4 wheeled case.
A 4 wheeled suitcase is designed to be rolled along on all 4 wheels giving a feeling of being lighter to pull, which is ideal for use on smoother and flatter surfaces, such as airports and train stations. They can on occasion be pulled along on 2 wheels on rougher services.