What is the right channel? It appears that you should have a balanced use of all different types of channels. This is what we call a marketing communication mix.
Depending on your needs, marketing strategy, budget, and target audience, your message will be deployed in each platform to get the most of each channel. It's up to you to identify your priorities and constraints in terms of time, cost, personalization, but also approach and tone, to identify the right channels.
The different channels of a marketing campaign each have their own advantages. It is a question of combining them strategically to get the best out of it. Dedicated software helps you not only with technical, but also with strategic aspects for more successful campaigns, due to their automation and analytical qualities, these are tools that will transform the way marketing communication channels are processed.