English Translation
This poem was written last night.
verfasst vs geschrieben?
This poem was written last night.
verfasst vs geschrieben?
Both are legit. Verfasst is more celebratory - cf. Verfassung - and cannot be used for long texts, for a poem it fits though.
Reflected on this, verfasst only works for texts that are finished afterwards. Roman/Buch/Gedicht verfasst. So, it can be a long text but it has to result in a completed artifact.