I would be wanting proof of service history and/or a recent written technician inspection on either machine and also a 'sit down and sew" on them.....perhaps even take a friend who is an accomplished sewer to do a test drive with you who could play devils' advocate for you. I had a series 7 Bernina and a Janome 8900. I sold both with full service records. (They are both long gone and replaced with 2 Juki's ...I couldn't be happier...enough said!)