~x-ai/grok-latest → A (4:1)

A delivers durable product design: cookie-based SSR theming (POST /theme, layout/auth re-issue so login keeps theme) plus real private-room wire fixes (item_path_for_api_in_room, forum_thread_web_url, RPC/CLI URL correctness and tests). B is a precise, valuable unblocker for E2E OAuth mocks (split regex, getRequestBody, null-safe state/token, redirect length) but is test-only and narrower in lasting project impact.