so its all very subjective depending on rider , looks like every company now has a aero road helmet and anyone wanting to be in a breakaway or sprint in the tour is wearing a aero lid (some tt hemets)
are there any that actually stand out over others and also some that just test slowwwwww
was looking at useing a spec evade for kona due to the heat (have use rudy wing there before and been very hot) , but with so many on offer now , its hard to choose without buying them all then trying to test em on thw road
The fastest is probably the Giro Aerohead (sans visor…as used by pro cyclists this year). As far as true road helmets, the Evade3 seems to always be at or near the top in tests.
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This recent thread could be helpful
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Thanks @kajet
I started that thread but never really went anywhere, and with the recent influx of aero road (and tt helmets) I thought some folks may have some more recent info on the new wave of choices
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LOL, didn’t mean to be sarcastic there - I genuinely missed the fact that that thread was “yours”!
Politely disagree on that thread “going nowhere”, for me personally as I benefitted from the advice contained therein 
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The answer is NO: all modern aero road helmets have quite similar speed vs ventilation performances (you can google various online comparisons). If you’re on a budget, you can consider the Van Rysel FCR (used by AG2R pro tour team); 50% of the price vs most competitors, and ~same performance
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There was 12 watts difference at 40km/h from best to worst in this list of helmets
They are in alphabetical order, not performance
ABUS Gamechanger 2.0
Carnac Evo
Giro Eclipse
Julbo Sprint
Kask Elemento
Kask Utopia Y
Lazer Vento Kineticore
Limar Air Atlas
MET Manta
Oakley ARO7 w/out Visor
Oakley ARO7 w/Visor
POC Procen Air w/out Visor
POC Procen Air w/Visor
POC Ventral
POC Ventral Tempus
Rudy Project Nytron
Scott Cadence
Smith Ignite
Specialized S-Works Evade III
Specialized S-Works Prevail III
Sweet Protection Tucker 2Vi
Trek Ballista
Trek Velocis
Uvex Rise Pro
Van Rysel FCR
Results are not mine, so cannot share details. CyclingNews did the test
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What’s 12 watts amongst friends?
More:
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there are a couple of more “climbing helmets” in the list, therefore, the difference between actual aero ones is possibly even thinner than 12w
It might look a little wacky, but of the 24 helmets we took to the wind tunnel, the fastest of them all was the POC Procen Air.
the Procen Air would save you 55 seconds vs the slowest on the test, or seven seconds compared to the S-Works Evade III in a 40km time trial at 250 watts.
The Specialized S-Works Evade III was second in our test, giving away 1.8 watts to the Procen Air
The S-Works Evade III is first and foremost an aero helmet, but it does everything very well, and for that reason, it’s our pick as the best overall.
so get the evade and don’t look back unless you care about 30-40s over a full, assuming you can even put out 250 for the whole thing.
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Some of the worst performing helmets are basically road helmets with some of the vents covered by the shell (looking at you, POC). I’d say the spread between “real” aero road helmets is more in the 6-8W range, and the spread amongst the “good” aero road helmets (Procen, Evade(s), Ballista, etc.) is 2-3W.
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I did velodrome testing this week and i did a test of Evade with Kona in mind. It was 5W slower at 42kph vs my current TT helmet, and for me its a small enough gap to chose it for the next WC. With the course congestion in Kona you are anyway surrounded by people most of the time so actual penalty might be even smaller.
We didnt have good aero glasses to pair with Evade, i am hearing that Oakley Kato is a fast choice. Will test it the next time 
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if you already have the oakley sutro’s (or sutro lite), possibly the kato’s won’t be much faster
When Spech did tunnel testing they found virtually no difference between glasses, even when getting fairly extreme.
@triprem what is your aero helmet ?
And do different glasses actually test differently?
I’ve never considered this but makes sense
That’s one way to keep sunscreen out of your eyes.