aero trumps weight... unless you are doing some major climbing.. 99.9% go full disc

Overall bike weight shouldn't be much of a factor at all. The impact of adding 100g at the rims is just about the same on a 30lb bike as on a 10lb bike.

^^^^This.

Even on hilly courses, deeper is faster. The exceptions would be almost exclusively uphill courses (Alpe d'Huez traithlon), and races with almost no flat (I did an Alcatraz variant that biked through the Presidio where there was literally less than 1 flat mile for the entire bike, and the speed limiter on the descents was my bike handling not wheel drag [so no aero gain on the downhills to mitigate the climbs]).

If a race lets you run a disc, run a disc.

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