Query - /usr/sap/trans

Hello,

We just installed our QA system. The question we are faced with is whether we should mount the /usr/sap/trans from DEV on QA. OR we can use QA's own /usr/sap/trans, because when we configure TMS, the files will be automatically FTPed by SAP to QA from DEV.

So, what are the advantages of mounting the same /usr/sap/trans in QA, furthermore, how should we go about doing the same. I mean should we just delete the existing 'trans' directory and mount it from DEV ?

Thanks in advance.