Why is "Unstoppable Force" better than "Anti-tank Gun Production I"?

Two Intel Bulletin Slot upgrades in Company of Heroes 2 are Unstoppable Force:
Pak43 Anti-Tank Guns build 10% faster.
and Anti-tank Gun Produciton I:
Pak40, Pak43 and ZiS-3 Field Guns build 10% faster
Seems like Anti-tank Gun Production I is the clear winner here, so why is Unstoppable force listed as uncommon while Anti-tank Gun Production I is listed as common?
Best Answer
Rarity doesn't always equal better perks. Typically, the rarer the bulletin, the more specialized it is. The reason for this is that if you were really in Pak43s, say; then you could have both Production I and Unstoppable Force in your roster at the same time, thereby granting you a 20% faster build time for Pak43s.
Hope that helps, and have a great day!
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