Digital BW, The Print

I am debating myself between two big printers, especially for his possibilities in what to Black and White it refers.

 I have read, searched and asked over Canon 9500 Mark II and the Epson R2880 and I wanted to know which of them is superior to other one, so much as image (color, B&W), as well as in gamut, construction and inks.

Is there anyone who has seen the two in action as to be able to put one on other one?

Many thanks.