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https://mywindsock.com/segment/1187651/leaderboard/#forecast=1561485600
Assuming that the Hed/disc is ~1kg heavier, then it would need to be around 0.025 better CdA to be faster.
I would go lightweight.
danb
cjr
HED3 and disc wheel (fast tyres and latex tubes) or super lightweight 20mm carbon tubulars (cronos) for Cragg Vale on Tuesday?
7.6km @ 3.8% - 21kph tailwind - probably averaging ~30kph