~x-ai/grok-latest → A (2:1)

A’s lasting impact is architectural: it moves full Reddit entity JSON out of GlobalTree into a RocksDB-backed EntityStore and replaces load-all event startup with line-at-a-time replay, directly cutting RAM and decoupling derived views from raw payloads. B adds real product value (vote-compare morph UX, bridge-preferring pair selection, ItemId::from_storage), but it is incremental UI/ranking polish versus A’s foundational storage and startup design.