In a Nutshell
Advantages obtained or not with any configuration vary greatly according to the shape, length, and curves of the pipes.
However
2-into-1
Generally, more common on smaller, engine bikes where the advantage is power increase and the power delivery, especially at low RPMs.
2-into-1 exhausts often offer a better-balanced airflow which can result in more torque and a smoother idle.
2-into-2
Are more common on Big Sports bikes, and perform best at high RPMs, making them best for top-end performance, but leaving a little emptiness at lower RPMs.
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