xsd:simpletype or <xsd:complexType with simpleContent?

Can someone explain these two constructs and any advantage or disadvantage 
to using one over the other?

Too me it appears that at a schema level these are equivalent and possibly 
at the code generation level as well.

I am currently using the following design:

<xsd:complexType name="AboveGroundIndicator_Type">
   <xsd:simpleContent>
         <xsd:extension base="xsd:boolean"/>
    </xsd:simpleContent>
</xsd:complexType>

<xsd:element name="AboveGroundIndicator" type="AboveGroundIndicator_Type"/>

This seems to be the equivalent:

<xsd:simpleType name="AboveGroundIndicator_Type">
         <xsd:restriction base="xsd:boolean"/>
</xsd:simpleType>

<xsd:element name="AboveGroundIndicator" type="AboveGroundIndicator_Type"/>

I see that one seems to allow extension where the other limits me to 
restriction, but I believe even with the extension definition, I could not 
extend my Type by adding additional attributes.

..dan
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