Short answer: Will you be posting your actual existing, working code? If yes, then I believe Code Review is better.
Our help center does state:
However, if your question is not about a particular piece of code and instead is a generally applicable question about (...) Higher-level architecture and design of software systems then your question is off-topic for this site.
which is sometimes understood as "We don't review design here", but what is then mainly missed is the first part: if your question is not about a particular piece of code and instead is a generally applicable question....
So basically, if your question is about a particular piece of code, then I think Code Review is the best place for it.