In case of acrylics, I used to use A’Kryl paints from Renesans but for newer works, I use mostly Rembrandt acrylics from Royal Talens. Additionally, sometimes I mix in some Maimeri Acrilico i Liquitex Basics.
Regarding watercolours – I’m only learning them, but I use Cotman from Winsor & Newton.
My newest discovery are water-mixable oil paints Cobra from Royal Talens. I don’t have much experience with them yet but they are really awesome!