The latter is my favorite for many reasons. This sensor is meant to be integrated in to wearable technology projects as an alternative to buying manufactured sensors which are made of rubber, metals, plastics and ceramics. My experience with a manufactured stretch sensor hasn't been good. It is one made of rubber with crimped metal hooks at each end. It broke easily and did not hold any properties found in materials that a wearable tech piece would mainly be constructed of; fabrics, thread and so forth. You can buy this conductive rubber in any length, but still, rubber isn't always the material you want for a project.
I've been experimenting with different ways of making soft sensors, particularly ones that utilize felting techniques. >>huge felt dork<<
This sensor is crocheted in a tube, it can be crocheted in a strip and other shapes. I myself have not tried these yet, but this is why I am sharing the technique!
This technique is a starting point and meant to be ran with.
Use this for any project you see it being applicable towards and please post them when you can, I would love to see what people come up with!