For those in higher production environments, print speed can be very important to meet deadlines.
Something to keep in mind:
With either 1440dpi or 2880dpi, with the latest generation Stylus Pro printers, make sure High Speed is checked for bi-directional printing (faster).
In the past, the recommendation for the highest quality was to uncheck High Speed for uni-directional printing (slower), but with today's technology there is negligible difference in quality between bi-directional and uni-directional printing.
I've only seen the benefits of uni-directional printing, with the latest generation Stylus Pro printers, on specialty medias that have longer dry times, or when data being sent to the printer is from an older computer/network that is slower than the printer can output. Data sent that is slower than the printer causes the printhead to pause and that will degrade output quality.
Dano
(The Epson Guy)