Digital BW, The Print

I notice that the R220 has a advertised dpi of 5760 x 1440 dpi with a
droplet size of 3 picoliters, and the 1280 is advertised at 5760 x 720
dpi with a droplet size of 4 picoliters.  

Does this make a difference in the dot pattern for black only
printing?  Would the R220 produce better quality BO 8x10s than the 1280?

Thanks for your advice,
Tom Krahn