Depends on detail
Price with no contract.
Battery life when typing or annotating.
Er.. Price and Battery life.
200 dpi is in the realms of "good enough" unless I put on really strong reading glasses. Obviously at same size of font the 533dpi or what ever will look like 600 dpi laser print to an extent, but if anti-aliasing is used then 200dpi is better than 400dpi laser and near 600dpi as it can't do intermediate shades.