[vaughandroid]

We use at both in my department at work. They is some overlap, but since each have different strengths I think they work well together.

RFCs are great for capturing discussions and exploring ideas in depth. You can get deep into the details if needed. ADRs are all about capturing a decision. They should capture the important bits of context and consequences, but without a huge amount of detail.

In terms of the process for producing these documents, if a decision is straightforward we will go straight to writing an ADR. If there are multiple options or we want to explore some corner cases, we'll start with an RFC. An ADR is often part of he output of an RFC which reaches consensus, but not always. Related RFCs and ADRs include links to one another.

If people are looking to get up to speed on something, their first port of call is the ADRs. If they have concerns, disagree with a past decision, or simply want to know more then they can dig into the RFCs.