The biggest difference between Blitz and Redwood is that Redwood makes the API layer easier with conventions and APIs, whereas Blitz abstracts away the entire thing into a compile step. So working with Redwood requires working with APIs like normal. But with Blitz you can almost forget an API is even there.
How does it work for clients using an old version of the app? I.e. if I change the db schema and update it for new clients, what will happen to older clients?
I'd also like to go even further and add some type of detection to the build that would notify you of potential issues.
"Hi, we can't handle any version skew so please interrupt what you are doing to click this button and reload the app."
As for the redwood vs blitz, I think I get what you're getting at but still not fully grok what _exactly_ it means/looks like (and what are the tradeoffs). I'll experiment with it, so I can develop the intuition myself :).