I've been using Pfaff and Husqvarna Viking machines for almost 20 years and would recommend them though there are many excellent brands.
My suggestion would be to visit a sewing machine retailer in your area and ask them to give you a demonstration of all the brands that they sell. They should also tell you about the computer software that each brand uses, the formats and the hoops available. In addition you will want to have a relationship with a dealer to have your machine serviced from time to time depending on use. Quite often dealers will provide free classes to get you started with embroidering if you purchase a machine from them. Getting started can be daunting and expensive. Embroidering has given me many years of enjoyment ... it is a great hobby!