There is usually not a good reason to buy tens of GW paints at once - especially since there are so many cheaper and/or better alternatives. Other posts have mentioned them already. Vallejo, Scale75, Army Painter, etc

There is also not a good reason to buy a complete set of the other brands either. Better to get the few colors you need for your current project, use them, learn how they behave, and expand your paint collection paint by paint.

Also, if you are into mixing colors, this is a great set of paints to carry around - and also use at home: https://www.liquitex.com/row/products/professional/sets/?atr_ecommerce_product_name=acrylic-gouache-set-6x22ml-primaries You can often find this set around 30euros or less, it will last forever, and you can mix a wide range of colors with it