Which of the following phrases ("Ein Saal voll von Menschen" or "Ein Saal voll Menschen") is grammatically correct?

Question

Which of the phrases is grammatically correct:
,,ein Saal voll von Menschen'' or ,,ein Saal voll Menschen''?

If ein Saal voll Menschen be acceptable, of which grammatical case is Menschen here, the nominative, the genitive or the dative?

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Remark on suspected duplication: This post concerns the construction of an extended postmodifier with an adjective; the post Which is grammatically correct: „Der Saal war voll Menschen“ or „Der Saal war voll von Menschen“? concerns the case-government of an adjective as part of a predicate; though being instantiated with similar examples, the two belong to different grammatical topics, one being attributive construction and the other predicative construction.

Answer 1

Both are grammatically acceptable, and both can be used interchangeably.

In the prepositional form, the preposition rules the case - "von" wants dative case, so "Menschen" is dative plural.

In the form without a preposition, the case is genitive (Finding out is not exactly easy, but works best if you try and add an adjective to the substantive, like)

Der Saal war voll wütender Menschen

which makes the real case a bit more visible.

Answer 2

Both are correct, but I think "Der Saal war voller Menschen" is the best (I'm from Germany, so...).

Answer 3

It is either "Der Saal war voll von Menschen." or "Der Saal war voller Menschen."

"Der Saal war voll Menschen." is slang.