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All dielectrics have different electrical properties; of real interest is the dielectric constant. The best insulator is, in theory air, but real world considerations make Teflon a very good option. Polyethylene is the next best choice, and PVC whilst cheap and easy to use measures very poorly by comparison. As well as having a low dielectric constant, Teflon is also impervious to both air and liquids and although this may not seem relevant, it does mean that the conductor it insulates will remain free from oxidisation for many years and there will be no loss in performance.
For more information relating to this subject, visit:
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/info/comp/passive/capacit/dielec/di_const/dicon.html *(who we borrowed the diagram from!)