Encyclopedias, in presenting potted versions of a given topic, are likely to present incorrectly potted versions of said topic. They have juuuust enough rope to hang themselves there.
Dictionaries have a much more limited - and therefore much more reasonable - remit. Their subject matter is considerably less contentious than are encyclopedias'. Therefore, if I really had to choose, I'd say dictionaries, on the grounds that it's much easier to find an encyclopedia that sucks at being what it is theoretically supposed to be than it is to find a comparably bad dictionary.