I use all kinds of paints, I don't stick to a single brand. Most of my paints that I use regularly are acrylics by Tamiya, Vallejo (both the brush and airbrush kinds), plus some Mig/Ammo, Revell, Mr. Aqueous, Italeri, AK 3rd Gen, and Army Painter. Ones I use less, but still have a good number of, are Humbrol enamels, and more acrylics by LifeColor, Rackham, Games Workshop (the kind they sold 15 years ago), and others.

Basically, I buy paints in the colours I think I need, with the brand only being a secondary concern. One exception there is that I prefer Tamiya and Mr. Aqueous acrylics for spraying whole models, as the base coat.