There are a ton of threads and posts on this subject. A search would lead you to hours of reading the "opinions" of others. IMHO it is a subject that some people just shy away from anymore because there is no real answer and it ends up us vs them.
You'll get the - fiver has more room than a MH - the fiver is cheaper in maintenance - fiver is less money. But in the end it's all is nothing but opinions. It usually comes down to what you want to spend and what your comfortable with. Many fiver owners end up with a MH some day. A few MH owners go back to a fiver.
But try doing a search and you'll probably answer every question you have.