right. unanimous 
I think we might go for the red.... the room has wood floors and white walls, a cream rug (not sure how that has survived with a 3 and 1 yr old but there you go),and one wall is filled with books. The sofa we have at the moment is aubergine-y velour and the colour is lovely and welcome in a pretty plain room.
I hear the safety of the brown but.. the red makes me smile inside...
... might check if the covers are removable and washable first though. Must be a bit sensible 