I'd say it's a lot more nuanced than B2B versus B2C. I know a lot of B2B businesses with huge volumes who want to focus on transactional email that have bought Adobe Campaign, and I've worked with many B2C orgs that need Marketo's lead management functionality. I think it's more useful to think in terms of business need. As someone mentioned above, Marketo is strong wherever an organisation requires a lead management function - scoring, CRM integration, sales capabilities, account based marketing, etc. Essentially you can consider this either B2B or what Marketo calls B2C considered purchase. If it takes a while for a consumer to make a decision (financial services, cars, luxury purchases, higher education, there are many other examples) and they need to have leads managed, prioritised, assigned, scored, and the lead needs to be nurtured, Marketo comes into play. Adobe Campaign struggles at all those things, but they have a wonderful toolset for consumer/web/segmentation/targeting/adcloud with large data volumes.
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