I've used Fompan 100 (or the rebranded version, .EDU Ultra 100) in Dektol 1+9, Parodinal 1:25 and 1:50, HC-110 dilutions F, G, and H, Xtol replenished stock, Df96 monobath, and D-23 replenished stock. As noted by Koraks, the differences are at a level of subtlety I can't discern, aside from the sharpness of grain in Parodinal and Dektol vs. the more solvent developers. If you're mixing your own developer anyway, I'd suggest D-23, as it's by far the simplest -- just the three ingredients (one of which is water).