You don't say which program your miles are in so I can only surmise AA in which case this thread would be better off in the AA forum
One of the great benefits of a Oneworld Award over a standard award in almost all programs is the ability to have stopovers.In AA for example a standard award US-Europe allows LAX-JFK(stop)-LHR(no stop)-MAD. A one world award would allow LAX-LAS-ORD-SJU-MAD-HEL-BUD-ATH-LHR-BRU-JFK-DFW-HNL-LAX stopping at any point you wanted - but in 3 weeks all you might see is airports