You might want to consider an unused machine. I bought my Bernina used and have not had any problems with it. However, they are heavier machines because they have metal parts.
My Babylock is easier to use. Since and Brother are made by the same company, you'd want to look at the features that you really want in order to make a decision. I'm make a list of what you desire in a machine and find a machine that most closely matches what you want.