General Navigation Best Practice Question: Application.GoTo vs. Range.Select

There are good reasons to parse code between class modules and standard modules according to the nature of functionality they provide, but this doesn't fall under any of them.

If you instead had

Private Sub CommandButton1_Click()
    Navigate "Flex1Home"
End Sub

Sub Navigate(sRange as String)
    Application.Goto Reference:=sRange, Scroll:=True
End Sub

... then the latter might reasonably go in a code module because it is non-specific to any worksheet or event, but invoking a procedure to replace a single simple line of code is ... not good.