The question depends on the engine displacement.
bigger engines have a cut-off point where rotating mass and vibration dictate multiple cylinders.
Hey Al I have ridden both singles and twins. In my experience the singles had more low end torque than the twins , however ther twins had the higher top end due to higher max rpm ( shorter stroke ) . Also the twins may have 2 carbs for the same displacement so more power results. The single has better engine braking and a subtle vibe that indicates that it is THERE ! . The exhaust note seemed deeper with the single.
Most ATVs and the Trykes before them all had singles ( low end torque ). Motocross bikes are also singles.
Each engine type has it's own personality.
Maintenance : easier to tune 1 carb than 2. Only 1 set opf valves to adjust . Only 1 spark plug to change.
That's my take.
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sds4
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