Is it worth paying more for Dulux paint?

My partner insists on buying the leading brand – but I’m wondering if it’s any betterEvery week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.We’re having two bedrooms and the landing painted, and my partner is insisting we go for Dulux paint, even though there are much cheaper options. Interestingly, a decorator friend insists clients buy Dulux