Add comparison with microsoft/azurechat to other samples documentation (#2703)

* Initial plan

* Add azurechat comparison to other_samples.md documentation

* Add overview of azurechat to other samples page

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: Pamela Fox <[email protected]>
Co-authored-by: Pamela Fox <[email protected]>

Author: Copilot

docs/other_samples.md

@@ -2,19 +2,57 @@
 
 There are an increasingly large number of ways to build RAG chat apps.
 
-## Other language samples
+* [Most similar to this repo](#most-similar-to-this-repo)
+* [azurechat](#azurechat)
+* [sample-app-aoai-chatGPT](#sample-app-aoai-chatgpt)
 
-Inspired by this repo, there are similar apps for other languages:
+## Most similar to this repo
+
+Inspired by this repo, there are similar RAG chat apps for other languages:
 
 * [**JavaScript**](https://aka.ms/azai/js/code)
 * [**.NET**](https://aka.ms/azai/net/code)
 * [**Java**](https://aka.ms/azai/java/code)
 
 They do not all support the same features as this repo, but they provide a good starting point for building a RAG chat app in your preferred language.
 
-## Other Python samples
+## azurechat
+
+Another popular sample is the Azure Chat Solution Accelerator:
+[https://github.com/microsoft/azurechat](https://github.com/microsoft/azurechat)
+
+AzureChat deploys a private chat app with a ChatGPT-like UX on Azure, with built‑in capabilities for chatting over internal data and files and optional extensions.
+
+Key differences versus this repository:
+
+* **Technology stack**: AzureChat uses a full JavaScript/TypeScript stack with a Node.js backend; this repo uses Python (Quart) for backend services.
+* **Use case emphasis**: AzureChat offers more features around user personalization, while this repo offers more features needed for enterprise scenarios like data ACLs and evaluation.
+
+Feature comparison:
+
+| Feature | azure-search-openai-demo | azurechat |
+| --- | --- | --- |
+| Vector support | ✅ Yes | ✅ Yes |
+| Data ingestion | ✅ Yes ([Many formats](data_ingestion.md#supported-document-formats)) | ✅ Yes |
+| Persistent chat history | ✅ Yes | ✅ Yes |
+| Multimodal | ✅ Yes | ✅ Yes |
+| Voice/Speech I/O | ✅ Yes | ✅ Yes |
+| File upload | ✅ Yes | ✅ Yes |
+| Auth + ACL | ✅ Yes (Enterprise-focused) | ✅ Yes (Personal-focused) |
+| Access control | ✅ Yes (Document-level) | ❌ Limited |
+
+Technology comparison:
+
+| Tech | azure-search-openai-demo | azurechat |
+| --- | --- | --- |
+| Frontend | React (TypeScript) | React (TypeScript) |
+| Backend | Python (Quart) | Node.js (TypeScript) |
+| Database | Azure AI Search | Azure AI Search |
+| Deployment | Azure Developer CLI (azd) | Azure Developer CLI (azd) |
+
+## sample-app-aoai-chatGPT
 
-Another popular repository for this use case is here:
+Another popular repository for this use case is:
 [https://github.com/Microsoft/sample-app-aoai-chatGPT/](https://github.com/Microsoft/sample-app-aoai-chatGPT/)
 
 That repository is designed for use by customers using Azure OpenAI studio and Azure Portal for setup. It also includes `azd` support for folks who want to deploy it completely from scratch.
@@ -28,7 +66,6 @@ Feature comparison:
 
 | Feature | azure-search-openai-demo | sample-app-aoai-chatGPT |
 | --- | --- | --- |
-| RAG approach | Multiple approaches | Only via ChatCompletion API data_sources |
 | Vector support | ✅ Yes | ✅ Yes |
 | Data ingestion | ✅ Yes ([Many formats](data_ingestion.md#supported-document-formats)) | ✅ Yes ([Many formats](https://learn.microsoft.com/azure/ai-services/openai/concepts/use-your-data?tabs=ai-search#data-formats-and-file-types)) |
 | Persistent chat history | ✅ Yes | ✅ Yes |