Assuming that you write your application in Java I'd recommend that you don't use a specific provider, but that you develop your application on top of Sun's JCE (Java Cryptography Extension). Doing so can make you independent of any underlying providers, I.e., you can switch providers easily as long as you use ciphers that are widely implemented. It does give you a certain level of abstraction as you don't have to know all the details of the implementations and may protect you a little from using the wrong classes (e.g. such as using raw encryption without proper padding etc) Furthermore, Sun provides a decent amount of documentation and code samples.
