SLS or SST for services?

On this page it is explained “Originally when SST was released, it was meant to be a way to use CDK alongside your Serverless Framework apps. While you can still do that. SST’s Live Lambda Development makes it a first-class dev environment for serverless apps.
So you don’t have to use Serverless Framework together with SST. Soon we’ll also have a migration guide to help you move over your Serverless Framework projects to SST.”.

It makes me confused.
We plan to use serverless for service layer for a production application that we will maintain several years.

What is the official recommendation : to use serverless for service layer and SST for infrastructures, or to use SST for services and infrastructures (because serverless will be deprecated and not the official recommendation in a near future) ?

The webpage has been updated, now there is no mention about “Soon we’ll also have a migration guide to help you move over your Serverless Framework projects to SST”.

What does it mean ? No answer and the sentence that made me confused was deleted, what should I understand ?
It’s even more confusing…