Similar prices might not mean similar coverage. Two camera coverage is the best. In fact, one should only resort to a single-camera coverage if no other option is available. The reason for this is simple. One camera can not have a good view of everything at all times.
People stand in front of cameras on a regular basis.
A good Videographer will have two cameras at different angles during the ceremony. Many will also only offer single camera coverage of the reception. This is fine but it is sometimes better to see reactions from the audience that only a second camera can provide. Also find out if there is a maximum number of hours for the price you are offered and make sure you can get all the coverage you need within that allotted time. Don't be fooled by a Videographer who is a member of a professional association.