Vforce vs. the Boyesen Rad valves? I've heard people argue both ways. Some seem to like VForce, some like Boyesen. Some people say VF3's are a similar design to the Boyesen's, but that I do not know about. Personally, I'd probably just go with whatever you can find cheapest. If price isn't a bother, flip a coin. They both seem to be a proven name.
Your not going to find a difference in power. Both reeds are extremely good and definitely better over stock. Find a good price for one or the other and get them. You won't be disappointed either way you go.
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