I know there isn't a native feature destined to determine which channel is best to send messages to each subscriber, but is there a way I can combine features so that I achieve this?
#Marketing Cloud
I think you might be missing my point. There are no standard features for doing this channel determination - so far we do agree.
What I am questioning is the value of doing such a prioritization in first place - as channels serve very different purposes and drive very different behaviour. Also, consent is also very often channel specific (or at least it should be) so it is ultimately up to the recipient's preferences to decide, which channels they want to engage with you in.
What one COULD consider, and what I have done successfully in the past, is to have an engagement driven "escalation path". I.e. you start with the least intrusive channel (email) and end up with the most intrusive (SMS). Meaning, that a campaign email, promoting up to 60% discount, will start as an email. It will give the recipient a broad selection of articles on sale, and provide details about the best offers. If the recipient chooses not to engage after some days (here it is up to you to decide, which criteria should define engagement), you can proceed to decide if the recipient is an app user (and send an app push) or an SMS (if you have their phone number). These two formats are quite limited, and will only be able to hold information like "FINAL CALL! Our sale ends tomorrow. Save up to 60%.
https://example.com/sale"
If you REALLY need to have a decision split based on engagement data from across channels, you will need to build your own logic in SQL, querying across the different data views, allowing you to derive most engaging channels for a specific contact. Do keep in ind though, that while SMS will have the biggest CTR, it can also easily lead to unsubscribes due to oversaturation.
