The article emphasizes the importance of understanding regional preferences when choosing between SMS and WhatsApp for marketing. The author, who has worked with global brands, initially favored SMS due to its lower cost. However, a client expanding into Europe highlighted that WhatsApp was the preferred communication tool, leading to successful campaigns during Black Friday Cyber Monday. This experience reshaped the author’s approach, prioritizing what customers actually use over cost considerations. Three key questions guide the decision-making process. First, assess what messaging channels are commonly used in a region. For instance, while SMS is effective in North America, WhatsApp dominates in parts of Europe and Latin America. Second, evaluate the cost based on messaging frequency and audience engagement. Even if SMS is cheaper, it may not yield results if the target audience rarely engages with it. Finally, consider the features of each platform. WhatsApp offers a richer, more interactive experience than SMS, allowing for multimedia content and conversational exchanges. The article also points out that using Klaviyo can streamline the process of managing both channels. It allows businesses to collect consent for SMS and WhatsApp simultaneously and segment audiences for tailored campaigns. By integrating both channels into a unified strategy, brands can optimize their messaging without overhauling their entire approach. The author advocates for a mindset shift: focus on creating engaging experiences rather than simply managing multiple platforms.