Marketo is a robust marketing automation platform designed for B2B marketing with complex sales cycles, while Klaviyo excels in B2C and e-commerce environments. Both platforms offer strong integration capabilities within their respective focus areas. Marketo's pricing is based on a tiered model, starting at around $895 per month for up to 10,000 contacts, while Klaviyo's pricing scales based on the number of contacts, with prices starting at $45 per month for up to 250 contacts. The choice between Marketo and Klaviyo largely depends on your specific business needs, resources, and marketing focus.