In ABM, the higher the likely reward, the greater the degree of personalization, time and resource you should apply.
Typically, One-to-many campaigns will sit at the cluster-level for this reason, focusing more on building awareness.
Then, as certain accounts within your cluster start to show signs of engagement and progression, the depth of personalization, specificity, and the resource required, increase.
At One-to-few, personalization evolves into relationship-building and deepening engagement – within the account and, gradually, the DMU (Decision-making Unit) – as you advance toward One-to-one.