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Is Plate of the Dark +1 ultimately worse than just Full Plate Armor?
The lowest-AC armor in BG1 is Plate of the Dark +1, but given the odd rule that magical armor is considered a "protection" item even though it doesn't offer a bonus to saving throws, my thinking is that Full Plate Armor plus a protection item like the Cloak of Protection +2, the Cloak of Balduran +1, Ring of Protection +2, or even just a Ring of Protection +1 (because of the saving throw bonus) is a better choice.
Obviously the FPA is 35 lbs heavier, but any character than can wear plate armor also tends to have high STR and therefore can spare 35 lbs of load...