To be of any real help folks can only recommend what they actually know. I have only used two PYRO type developers so can only say what I know about them. 510-PYRO is simple to use but needs heat to make up the stock solution. The results are great if you want a nice long range of tones with readily controlled highlights. OBSIDIAN AQUA is easier to make up and uses less expensive materials, BUT has two stock solutions, A and B, so there are two lots of measuring out to do but that is really no hardship. The sharpness it delivers is remarkable. It has become my go to developer.
So there's my attempt at helping you narrow it down. Either developer is great and they both last indefinitely as stock solutions. You won't regret using either of them.
RR
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