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It depends on whether or not you think you will need channel based deliverables for stems, how many objects you anticipate using, if the Atmos master will be used for localization downstream, and what delivery specs you need to meet.
The Renderer has 128 inputs. Using multiple bed means less inputs for objects. However, if you think you will need stereo and 5.1 M&E or if a dialogue still will need to be replaced for additional languages for an Atmos deliverable than using multiple beds (and associated groups with the required objects) will help future proof your content. Depending on the production it could be desirable to add a group with either a bed/objects or just a bed or objects for a filled M&E.
A composite/single bed allows for the use of more objects. You can still have all the beds you need in your session/project but you may need to perform multiple mastering passes (selectively muting bed and object) to get channel based stems from re-renders. Depending on the number of deliverables and the duration of the program this could be time consuming but not impractical.
Hope this helps.
Best,
Adam
Thanks for your response. It gives me lots to ponder. I appreciate it.
Rikk