ClassLibrary

>Hi everybody,
>
>I've decided to write a simple bridge class library I want to be able to use from VFP but also may be from our .NET Web Project.
>
>My first question - do I need to chose just Class Library or Class Library (Portable) project type in VS 2013?
>
>If someone already used the second type, is the .dll bigger than just Class Library?
>
>Thanks in advance.