THats one nice thing about the GC vents, they have a pan that channels water. Sometimes when questions of good enough or not come up its a good reference point to see how the OEM would address it. Typically OEMs will not leave wide open holes through the hood into the engine bay but keep in mind there are a lot of open holes to the engine bay on a TJ. MANY people have the bent metal vents on TJ hoods so it's likely safe to say it's not an issue but if it worries you there are ways to address it.
I think the JL hood vents would be cool if you can find a bent up hood. Here is how Jeep decided to deal with hood vents.
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