I've joined a new company that uses Marketo after previously using Iterable and sorely miss Handlebars functionality. Handlebars allows much more powerful control of what content is shown, so you can better personalize and don't have to create multiple versions of your email for different audiences.
https://support.iterable.com/hc/en-us/articles/205480365-Personalizing-Templates-with-Handlebars-
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