The choice between SMS and push notifications depends on various factors such as audience, industry, and product. While both channels offer timely messaging, they differ in terms of engagement, visibility, and delivery method. SMS tends to have a higher open rate, but users have less control over their preferences, whereas push notifications allow for greater customization and can be less intrusive. When time is of the essence, SMS is often preferred, while push notifications are better suited for situations where urgency is not as critical. In some cases, using both channels together can enhance campaigns and ensure audience engagement.