Attack bonus and Enhancement bonus do not stack with each other. It will always pull whichever is highest.
Enhancement Bonus is Attack Bonus + Damage, so it is always the better option. Enhancement Bonus also pierces DR, yes, because of the added damage.
It will not stack vs. orcs. It'll just pull the +1. The most common usage of them together will be:
+5 Attack Bonus
+4 Enhancement Bonus
(Also, you can totally ask these questions in the
General Questions topic instead of making a new thread!
)
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