Some people are fiercely loyal to their brand of machine, some wouldn't give some brands house room, and others just buy what's on sale.
: Why do you own yours
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I'll go first. When I first started sewing about 55 years ago (ouch) as a little girl. I used my Mom's Singer treadle. My sewing became much more "professional" when I was about 12. At 14 I was given a brand new top of the line Singer which I used through college. My family bought it for me and bought a Singer because that was the brand they trusted (as well as Kenmore from Sears). That machine helped pay my way through college as well as made all my fancy dresses for dances. It even made a few wedding dresses. I must have owned that machine for 17 years.
When I was in a better financial condition in 1977, I bought a top of the line Bernina. Mainly because it was a Bernina and it sewed garments like a dream. I used that machine for garments and home dec until we left for Italy in September 1994. It still resides with DD in California (she doesn't use it).
I didn't do any sewing since we lived like nomads without our "stuff" until landing in Singapore in 1999. I didn't work while in Singapore. Singapore is fabric heaven. My good friend and I bought an inexpensive machine (can't remember the brand) which resided at my house. I made our Millenium ball gowns on it. But I left it with her when DH got his job in Switzerland. Since I didn't start off working in Switzerland, I need something to keep me busy. Golly, we're in the land of Bernina ... I bought my 2000 edition of the 170 without embroidery module.
When I retired in 2007, I started to quilt. I didn't need a work wardrobe anymore (and I had lost all my excess weight & could buy clothes in shops) and wanted to express my creativity through sewing. This March I bought the Bernina 630E.
In short, I went from major brand to major brand because of reputation. I am very pleased with my Bernina but that doesn't mean I wouldn't be happy with another brand. It does what I want it to do well and I am pleased with the results.