ASP.NET WebForms on the .NET Framework v3.5 or higher gives you a set of new features to quickly create CRUD functionality. One example would be "dynamic data", see http://www.asp.net/dynamicdata. Also, as you might know, there is a shipload of integrated data controls like DataGrids, EditGrids and others available to use.
Generally, ASP.NET WebForms provides easy-to-use and rich out-of-the-box controls. Using those, you can quickly develop working websites without caring much about the exact HTML markup, speaking URLS (SEO) and so on. This might be totally okay for a small-scale intranet application though.
In MVC you have total control about the HTML output but in exchange you will have to build complex controls manually, including JavaScript functionality and more. MVC applications are often cleaner and easier to maintain on the long run since the framework offers a unit-testable and extensible architecture that forces a separation of concerns.
From what you said about your project, I think that you'll be fine with ASP.NET WebForms, especially since you seem to have experience in WebForms development. MVC definitely takes some time to learn.
The current version of MVC is 2 by the way. Both ASP.NET WebForms (commonly and wrongly refered to as "ASP.NET") and ASP.NET MVC are build on top of the ASP.NET Framework, whose current version is 4.0 :)