I've been using Ansco 130 print developer as my standard for a while now. It's famous because a variant of this developer was a favourite of Ansel Adams. It's not something you can buy off the shelf, but it's relatively easy to make....and well worth it.
There's a lot of commentary out there about its magical properties in bringing out highlight detail and producing beautiful prints. But, for me, there is one unique characteristic of this developer that makes it well worth the effort of sourcing the ingredients and making it: it lasts for months at working dilution, even with repeated use....