PVC roofing membrane
PVC is the most popular in the UK and make up about 80% of the market. Its fairly easy to intall, flexible and the joints are heat welded.
This is an elastic, synthetic rubber roofing membrane and is commonly used with domestic projects. An EDPM roof kit requires complex detailing to ensure you avoid water ingress into the membrane however an EPDM roof kit can be made up off site with penetrations pre installed.
TPO is seen as a more environmentally friendly option and is heavily used in civil engineering such as for tunnel waterproofing and pond linings. In the past it was sensitive to UV light but this issue has been solved increasing its life expectancy. The issue with TPO is it cannot be welded dirty and can be difficult to keep clean on site.
This product was developed to improve some of the characteristics of TPO. It doesn't have any of the dirty weld issues and is very simple to install. Whereas PVC or TPO need to be patched small punctures in TPE can be resealed using the application of heat.
PIB is the oldest single ply roofing membrane some roofs are still up were this has been used for 50 years. PIB membrane also has a self healing edge making it simple to install.