De-rated thrust take-off

[Altyre]

Hi guys
I have two contradictory answers for the same question in two books:
Will a reduced thrust take-off result in more or less trip fuel burn?
One says more because you don't get as fast to the altitude of your best SFC. The other one (which I agree with) says less trip fuel because you burn less on T-O, and then climb on the normal climb profile.

Thanks for clearing things up.