The former is used for Soap calls, the latter for rest (I assume you have also included Jackson)
What you're doing in the former is declaring an endpoint which will be called upon an incoming soap call with the appropriate namespace and localPart. In your case PersonRequest.
I would recommend taking a look at chapter 3 of the reference guide which explains a simple example: http://static.springsource.org/spring-ws/sites/2.0/reference/html/tutorial.html
The latter is just for a rest call to the url and will transform the incoming parameters to an PersonReadRequestType instance.