Dektol is a pretty long lived paper developer. Comes as a powder and you supply the water and elbow grease to mix it. With Edwal's you are buying their water and their mixing plus it don't last as long. A gallon of stock Dektol will last a long time mixed at 1:2 and longer if mixed 1:3. There is some talk that anything weaker will cause the dmax to not be as strong. Personally I have used Dektol 1:5 for 5 minutes and did not think the print was comprimised in any way.
I mix Defender 55 from the Darkroom Cookbook and I like it very much. I don't get the green tint with the warmtone papers that I see sometimes with Dektol. The green is removed with Selenium toner anyway.