I’m not sure about those specific instruments tbh but often the characteristics of vintage gear lend toward less stability/consistency. So tracking might not be as good, synths might require frequent retuning (and therefore are often out of tune), and multiple oscillators will drift more independantly from each other.

Often when people describe analog synths as sounding ‘modern’ they mean clinical - i.e. very stable oscillators, everything in tune - less of an organic presence.

Some will prefer one over the other, or different characteristics in different situations.

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