I feel that it is a major benefit to be on the MLS if possible. Here are a couple of reasons why:
1. You are getting exposure through another outlet that lets agents show the property to their clients.
2. Typically the clients coming from the MLS are pre screened by the agent. In other words you are getting rid of the scam artists that might come from Craigslist.
3. It is another marketing tool to positively market your property.
Hope this helps and feel free to contact me with any additional questions.
What is your goal? To find the best renter, right?
My opinion is that if you are looking for a quality tenant, then I would suggest the MLS and this is why. People that ask a Realtor to help them find a lease generally have a shortage of time. They want an expert to just take care of it.
Likewise, investors and owners using a REaltor know that they will handle most of the details, and IMHO you will more likely end up with a quality tenant.
I think leasing a home you are going to get better quality people in from West Side Rentals. I would do all three in that price range: Craig's list Westside Rentals and the MLS.
Keller Williams Wilshire