I think it is important to mention here that all industries have a preferred method of viewing work. You want to make sure you show your work in that preferred way otherwise whomever is viewing your work will not think of you as actually being in that industry.
For instance, in advertising, the preferred way to view printed work is in a bound book. If you should up to an ad firm with loose prints, they would not take you seriously.
For the fine art genre, it may be totally different though. Actually I think loose non-matted prints is the preferred way to view work. I am not sure here though since I am an advertising photographer, not a fine art guy. I would suggest reaching out to well known fine art photographers who show their work often and get their take on it.