Quote Sherbert Dip="Sherbert Dip" O'Loughlin is arguably a better all round player, but he's not a better leader
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'Arguably' being the operative word.
If 'all-round' means having a complete skill-set then Sinfield's (at times extraordinary) kicking game and his tactical awareness put him streets ahead. In all other areas I don't think (and the stats bear this out,) that there's much to choose between them.