Digital BW, The Print

With epson ultrasmooth paper, is this considered a matte paper, thus using matte black 
settings in QTR or should  I use photoblack setting?

Is this subject to my own discretion and liking, or does the paper require one or the other. 
With matte or gloss papers the choics is clear to me, but with papers that are in between, 
i.e ultrsmoothe, semimatte, luster finishes I'm not sure which black to select .

Thanks