Best Pratice on OLAP Connections

Hello Experts,

I 've been trying to learn BO and have came across one doubt.

What is best practice to create OLAP connection (BICS Connection), meaning ,

1. Does we have to use single OLAP connection to all BO reports OR

2. Create new OLAP Connection for each BO Report we develop.

What is impact on each of above point. I have tried to seek an answer on this question on SDN but most nearst answer I got it , "it is depends on design" but I would like to understand its porns n cons for better understanding.

Does someone share an knowledge on about points ?.

Thanks,