I have several motorcycles, mostly old and 3 mopeds.
Generally speaking, I find the motorcycles to be economical, comfortable, easy to handle and keep up with traffic and they get you there in the same or less time than a car. The only down side is they crash heavily from all that inertia. Oh well, I have almost recovered from the last one. : )
Mopeds, on the other hand are uncomfortable, having rudimentary "pogo stick" suspension. They are too slow to keep up with traffic in most places, a typical 15 minute trip becomes 45 mins. Handling and brakes are on a par with the rest of the machine but you can stop and get around corners. Like most 2 cycles, they are a bit noisy, smelly and drip a little oil when parked. Having to carry 2 cycle oil is a bit of a drag too.
Why do I ride one? I am not sure, you need to get on one yourself and take a ride.
If the answer to your question is not obvious, you should stick to your big bike. If you can't get the grin of your face, buy a ped and join us.