Keeley TS-9 vs Keeley SD-1

I already have a Keeley SD-1, but I might posses a Keeley TS-9 soon. How do they compare ? I realy like my SD-1, so it will be hard to beat. I have a boss DF-2 on CL for trade and a guy offered me a Keeley TS-9. It's actualy an 85 TS-9, so it's an original MIJ model. I think the SD-1 and TS-9 would make a great pair. It would also make my board look better. (It won't have so many Boss pedals.) That doesn't matter though. I'm only interested in the tone of the pedals. I've come to find that Boss pedals are actualy realy good, that's why my board is mostly made up of them. The reason I'm trading the DF-2 is the fact that I prefer OD over distortion. I actualy use the DF-2 to boost my SD-1 at the moment. I'm not sure if I'd use the TS-9 as a separate OD, or the same way I use my DF-2. Who knows maybe it will be the opposite, boost the TS-9 with the SD-1. Any input would be appreciated.