TLDR Tech / Dev
WebSockets vs. SSE should be about ordering and correctness
The real WebSockets-vs-SSE question isn't about latency or payload but ordering and correctness. Data split across two streams can race (a tag add and remove arriving out of order leaves the UI permanently stale). WebSockets are bidirectional, so reads and writes share one connection and the server can recompute and send the correct result regardless of order.
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