I don't know the
Cooper Seabird but I own a
Cooper 416 and I can tell you that, as a
live aboard she is very comfortable. Having two separate cabins is a real advantage even for a couple and if you have guests it is essential. She
sails really well also. She is not particularly fast but she can handle anything you can. The main advantage to owning the smaller
boat is the ease of handling. 42 ft is a large
boat particularly in crowded
marinas and even more so if you are
single handing. The 416 has plenty of freeboard but it's a big jump down to the
dock. However, soaking in her spacious bathtub afterwards can make up for most discomforts!