I'll start -
Maelstrom:
Juno/PWM for creating fatty, low passed, moving basses.
Fuzz Harmonics/Breath Voices for distorted bass, layering. The waveform sounds pretty gross when you load it up with the motion on, but if you grab just one of the nice grains you'll find a nice, thick, distorted sound.
Sweeping Square/Square*4 for morphing square wave basses.
Plastic Pipe for melodic synths. Also sounds goofy initially, but the waveform has a couple g spots. Good in layers.
Thor:
Multi Osc/Analog Osc PW, cause mmmmm, thick reeses.
Subtractor:
7 cause it's smooth and sounds good as a wub.
8 for it's plucky, metallic sound... good for FM.
10 cause of it's bottom end.
18 for it's grit and FM goodness.
24 just cause of Stagga

Hoping to learn some new uses for oscillators that I haven't otherwise found too useful.
Hopefully I have also sparked some insight.