But if you understand what makes the compared oscillator sound “better” then you can recreate it is my point.
Out of the box then of course it isn’t going to sound the same as say a vintage synth, but then listen to what it is about that oscillator that is different, for example is it drifting or does it have a darker tone or a wider pulse or a higher level into the filter, etc.
That is what I meant by comparing apples to oranges, oscillators are very simple circuits there isn’t much variation at all, a square wave is a square wave by its very nature, what makes a synth sound a particular way is how that square wave is being modified by the rest of the circuitry.
If you can figure that out and assuming the synth you are wanting to recreate it on has the facility to recreate these differences then it is just a matter of dialling it in.