You are launching a new series of advanced bike repair workshops. Which channel should you use to send the initial message that includes the full curriculum details, links to registration, and rich photos of the instructors?

Email Marketing is the most appropriate channel for this scenario because it excels at delivering detailed content, rich visuals (like photos of instructors), and multiple links (for registration and curriculum). The nature of a workshop curriculum requires more space and formatting than a text message can provide. While SMS offers quick delivery and high open rates, it is inherently limited in character count and the ability to display rich media directly within the message, making it unsuitable for conveying extensive information and visuals. A mix of both channels could be effective for follow-ups or reminders, but for the initial message with comprehensive details, email is superior. Sending a "long text message" is generally not best practice for SMS, which thrives on brevity.