Apart from the purely optical factor, the hard polyester strap can quickly rub against the neck and is very uncomfortable, especially in warm temperatures. However, it is correspondingly cheaper and is definitely sufficient if you are not constantly taking pictures.
A breathable leather camera strap, for example, fits snugly against your body. A leather strap is more expensive, but also more durable than a polyester strap. There are also neoprene straps. These are very soft and often have nubs to help hold the belt in place. What you ultimately choose is up to you and your preferences.