Digital BW, The Print

I am currently running a 1280.  Thinking about a new printer.  Noted 
the following differences in the specs:

2200 - 2880x1440 dpi, 4 pic droplet, 7 inks

1800 - 5760x1440, 1.5 pic, 8 inks (gloss optimizer)

These numbers seem to indicate the 1800 is more capable of producing 
finer images.

Is that the case?

Is the 1800 the better choice of the two for B&W?

Help appreciated, Val