1.Canonical Gospels earlier

First, from the perspective of the time factor alone, the four canonical Gospels are much earlier than their Gnostic counterparts. While the earliest Gnostic Gospels are perhaps dated from about AD 140–200 (see the comments below on the Gospel of Thomas), the canonical Gospels may be dated from AD 65–100, a difference of 75–100 years earlier on the average. Even though these Gnostic texts possibly include earlier material, the Gospels certainly include traditions that predate their writing.