* Nitrate
* Mono acetate
* Diacetate
* Triacetate
* Kronar/Polyester/Estar

Only the Triacetate and polyester are still made in any meaningful quantities.

Nitrate base has the best record for longevity; over 100 years.

Polyester currently has the vote for best archival properties; all forms of acetate suffer from vinegar syndrome eventually.