GridFS, S3 Storage or local File Storage

I need some help to decide which storage engine to use. Default for RC is GridFS. But I’ve read that some users may have trouble with it. Currently I can’t descide which storage engine I want to use. What are the pros and cons for each of them?

Thanks for your help in advane
Thorsten

Hello,
has somebody an advice for me for the topic above?

Thanks
Thorsten