[soulfuldog]

What models of Kobo & Kindle are you comparing? If it's the Glo HD v the Paperwhite, then the Glo tends to have a bluer tinge to the light than the Paperwhite (though see meeera's comments about variations between units never mind variations between models!), that apart I don't really think there is any difference in 'whiteness' between the two. The top range Aura H2O v the Voyage are both the best looking screens, with the H2O ovbviously being that little bit bigger.

The difference between the capacitive and IR touch screen is that the former gives you more control than IR touch, I personally find capacitive to be more responsive, but unless you do lots of selecting text, it's not something that you would probably even notice. There is a question of the capacitive layer distracting from the clarity of the text slightly, I'm not sure if there is a difference in this between the Paperwhite & Glo HD, not that I can see from videos but I have never seen the two side by side with my own eyes. Certainly it's not an issue with the Voyage, the text on it is certainly sharper looking than the Paperwhite and only matched by the Aura H2O.

If you like fiddling with your ereaders to get it looking a particular way, then go for the Kobo. Straight out the box the Kindle is just fine for most, but there are more options to get the Kobo to look how you want it. And with typography control being of interest to you, certainly try a Kobo first.