There are times where the Gospels are consistent, and times where they are inconsistent about the events surrounding Jesus’ resurrection. Here is a chart comparing the events between the Gospels:
So, how many men and how many angels really were at the tomb?
There is consistency about the general events, but the details clearly aren’t all coming from reliable sources – otherwise there wouldn’t be so much differentiation.
Considering this is the key event that Christianity is based on, the inaccuracies should suggest that we read the rest of the Gospel accounts with an awareness of the possibility of error. If the defining moments of Jesus have consistency issues, the less important Jesus moments have a greater possibility of larger issues of inconsistency with what really happened.