The larger the resolution the slower the device will be cause it needs to process more pixels.
I agree that openness is the greatest value for Neo900.
Before Neo900 got announced I was considering Jolla as my next phone, but they failed to deliver on the 'truly open' promise. The alternative would be to run something like Replicant/Cyanogenmod on an Android device, but with the Samsung backdoor news Cyanogenmod doesn't look too good. And Replicant doesn't support GPS on any of its target devices. So that really leaves little choice as to what phone I'll buy next, and currently Neo900 is at the top of my list.