If you are uncertain and live in an area where some of the larger shows - sewing expo, AQS shows, Mancuso shows - those type shows. Go there. All the major brands will be set up with machines that you can test drive and then you will be able to look at several on the same day.
Personally, there are many great brands and I think over the years I've accumulated most of them. A bernina, viking, janome, brother and recently gave a vintage singer to my daughter.