Oh man. That's tough. They both sound very, very good. The Oracle is probably the more wooly of the two. The clean channel on the Blackbird is tasty. I've been comparing the two all weekend and I keep going back and forth on which I prefer.
Having two channels is +1 for the Blackbird.
Being able to easily tube roll is +1 for the Blackbird.
Both have great EQ control. Both can sound deep and full.
Neither are the most pedalboard friendly but an edge to the Blackbird.
The Range control on the Oracle is nice.
Both have plenty of volume.
Both have tubes and transistors.
The Blackbird is capable of plenty of OD — way more than the Oracle.
The Oracle is maybe a little more...lush sounding?
Hmm....