Blogging vs Wiki's

While having to do two new ways of communicating blogs/Wiki I thought of what I think I would be able to use more effectively in my classrooms. All the blogs that I have visited for physical education started good for a short time and then stopped being used by the writers. I don't know if they were done just writing about a topic or didn't have a following. With the wiki it seems that you could use it more easily in your classroom. It seems like it would be easier since it more like building a website with links, pictures etc. You could use it for numerous units or activities. Blogging seems easier to set up but the wiki seems to be a better long term asset for the classroom use. I need to do more searching on PE wiki's. Does anyone know of a good one to follow?