DVD+ Was a lot more expensive when it first came out and they do cost a little more now although its only pence.
But the fact is Xbox reads DVD- better ( usually it seems ) so thats how i burnt it.
As for a war i dont think there was one really ??
DVD+ was supposed to be the newer more reliable format but then once writers that could read and burn either were produced it just became a matter of taste what media people use.
HOWEVER !! you could only get 8.5 gig in DVD+ format dont forget