Peter,
Were you more involved in the procurement or the sales processes, of logistics?
Another way to look at it is that you can learn any module, doesnot make a difference. The most important thing is the business process knowledge which, as it seems, you have.
In Coca cola, which documents were you working with PGR or PGI or shipments or.....? This could also be a factor which will help you to select the module. But both are same and it does not matter in the long run.
TW