I've met people who only will ride with their "buddies", that's one take. For them it's a social event.
If you ride alone you can go when you want, stop when you want, wherever you want and for how long you want. You can speed up, slow down, turn down any road you encounter. You can sing really loud and off key without bothering anybody. Zig zag, wheelie, whatever turns your crank.
It's all personal preference.