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Not necessarily. I prefer flexible nubs, because the pressure remains more consistent against the BB, as there are two levels of flexibility (the bucking and the nub) that will affect the BB, whereas if you have a hard nub, it's just one level of flexibility (the bucking), backed by a fixed (solid) nub. This means a BB sized at 5.95mm will receive the an increased amount of pressure as a BB at full spec of 5.96mm, when it should actually receive a variable amount to deal with the difference in tolerance for an equalized pressure. A flexible nub will allow for a greater range of variation in flexible pressure, whereas a hard nub will limit it.
Anyways, this is just my opinion. I'm not an engineer and have no quantifiable proof of it. I've personally had good experience with SCS, H-Hop, and Firefly nubs... I prefer the Firefly nubs for the durability aspect alone, as it gives the rubber more give.
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