I have a Brother 1500 and recently got a used Juki. I prefer the Juki. Nothing wrong with the Brother 1500 and it served me well. I am now going to upgrade to this:
https://jukiquilting.com/products/j-150qvp.html I test sewed on many different models for machine quilting and nothing came close to the Juki in my opinon. Not even the Bernina. I have an older Bernina and it is a fine machine. I have two Janomes and they are great machines. I also have Brother embroidery and a Brother 420. I know the differences from sewing on all of them over the years.
You have to test sew on them all and then the one that feels right is the one to buy.