The more granular the listening the more tactical the insights tend to be. This is likely true across all research methods but especially so when it comes to VOC data.
In general, there are 4 key levels to consider when thinking through levels of granularity for Voice of Customer data:
https://medium.com/@mshotts/getting-the-most-out-of-your-voice-of-customer-data-a14ad7791e17/