I don't think there's much to debate here.

I love PMK.
I haven't used Pyrocat-HD much but it seems pretty interesting. Lots of people love it.

Isn't it nice to have choices?

After all, we could be stuck with D-76... not that it's bad or anything, but what if it were the only developer we could use? I suppose we could have long threads about whether 1+0, 1+1 or 1+3 is the best way to use it.