Different 1440x720 resolutions?

[rog1@iinet.net.au]

Hi,

I have an epson stylus colour 3000. I'm thinking about upgrading to get a 
better quality print for fine art printing because the dots in the prints 
from my 3000 are often obvious, especially in lighter colours. I've had my 
3000 for about 4 years.

However a friend of my'ne has an epson stylus colour 1160. I cannot see 
any dots on any his prints. Both the 1160 and 3000 have 1440x720 dpi 
printing and 4 colour. Why the difference in quality? 

I'd be happy with the print quality from the 1160, but now I wonder "why 
would I upgrade to something of the same resolution?".

Must be an obvious reason that I'm missing.

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