The flow differance is so small it is not worth worring about. As for which is cheaper/easier to find. That is up to your local market. Generally it is easier to find a B16 head so they are cheaper but this is not always the case.
I've herd both heads will work great but the gsr head will give you more compression. Like lsvtec said the flow differance is so small it won't make much of a differance.
Phillip and I found that the GSR and B16 heads make the exact same amount of power stock on top of identical B20 blocks... same compression, same rods, all stock head pieces.
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