In the sawtooth sample, the Pro 2 has more edge (more upper harmonics?), but there is also more detune between the oscillators - the Prophet 6, on the other hand, is smoother (perhaps due to less detuning?) and has a more clear fundamental tone - but it's not by much, if at all.
Were these examples using exactly two active oscillators on the Pro 2? If so, that's a pretty good argument in the Pro 2's favor. Perhaps the filter makes all the difference (by comparison to the Prophet 12's Curtis-based VCFs)....