Company size decides it in practice. Below 200 employees the split is a dead heat — 38% each. Above 200 it isn't close: 85% Salesforce in the 201–1,000 band and 100% above 1,000. Size, not sector, is the deciding variable.
The two are not really competing head-to-head across the whole market. Salesforce is the system of record in 63% of high-growth companies; HubSpot appears in 77% of stacks but is the CRM for only 33% and a marketing layer beneath Salesforce for another 44%. The realistic question is often which one runs marketing, not which one wins.
Every claim above comes from work LeanScale published. These are the sources.