I have a VBA macro that validates user entered data (I didn\'t use data validation/conditional formatting on purpose).
I am using Worksheet_Change event
Assumption: That "distinguish the two" means to distinguish adding/deleting a row from any other type of change. If you meant, how to tell if the change was an add row OR delete row, then ignore my answer below.
In the case of inserting or deleting a row, the target.cells.count will be all the cells in the row. So you can use this If statement to capture it. Notice I use cells.columns.count since it might be different for each file. It will also trigger if the user selects an entire row and hits "delete" (to erase the values) so you'll need to code a workaround for that, though...
Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)
If Target.Cells.Count = Cells.Columns.Count Then
MsgBox "Row added or deleted"
End If
End Sub