Write .aspx Page Or .aspx.vb (Codebehind)?

i want to know, if is better to make an entire page in the aspx file or in the aspx.vb file. If you have to decide, which one do you choose? ie in aspx:

Code:
<asp:Table ID="Table1" runat="server" Width="980">
<asp:TableRow>
<asp:TableCell>
SOME TEXT
</asp:TableCell>
</asp:TableRow>
</asp:Table>
ie in aspx.vb:
Code:
dim tabla as new table
tabla.id = "Table1"
tabla.width = 980
dim fila as new tablerow
dim celda as new tablecell
celda.text = "SOME TEXT"
fila.cells.add(celda)
tabla.rows.add(fila)
form1.controls.add(tabla)