my personal opinion -
buy alot of memory cards. this way you can keep all the photos.
but you have to wait till you get to a computer. but at least you have all the photos
i understand what your asking, but my opinion is to keep em all and wait, then view and sort them later. it is best to to do this, because ya never know what you may get, and you might accidentally delete "that shot" that you wanted, but wasn't able to properly view it on the road.