I loved Agfa Portriga Rapid for its rich blacks. I used to do a lot of night photography and I was very satisfied with the results. It was a warm toned paper but I remember a photo magazine in the mid 80s (Darkroom Techniques, I think) printed a recipe for a developer that changed the paper from a warm to a neutral tone. It involved adding chemicals to Dektol and since it's been so long I can't remember the ingredients. It did slow down the development time to a minimum of 4-5 minutes but it was worth it. After develop and fix, I sometimes would use selenium toner to give it a slightly cool tone.