The only brand I'm currently using that I was 20+ years ago is Avantgarde. I started with their Uno (bought new in 2002), then Duo (circa 2006 bought used in 2019) and Duo XDs bought new 4 or 5 years ago and still use. Unlikely to change speaker brand any time soon.
In the past, probably the only "brand" I had for 20+ years was my home-built Wharfedale Airedale speakers (the big 6 sided ones with 15" bass drivers), although I changed the drivers from Wharfedale to KEF after about 15 years - a big improvement in sound quality.
In the past, probably the only "brand" I had for 20+ years was my home-built Wharfedale Airedale speakers (the big 6 sided ones with 15" bass drivers), although I changed the drivers from Wharfedale to KEF after about 15 years - a big improvement in sound quality.