No, I meant itemization. Your typical AD-based jungler has access to good mid-tier off/def based items like wriggles/wit's end, or stuff like phage/hexdrinker can build something useful later on when you do get the gold.
AP on the other hand has access to top tier off/def items, like Zhonya/abyssal, but they are too expensive for the amount of money the jungle gives you. I know because I regularly play AP amumu jungle, and it's VERY tough to stay ahead of the damage curve (while still building AP) unless you snowball.
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