Paper is the best (and the most cheap) way to dealing with big scores. Kindle has trouble with digitized scores of old editions (ej. IMSLP ones), because they are escencially a bunch of jpgs or pngs joined in one archive and the LCD of the Kindle isn't designed to work with images, but with fonts and characters. The scores who fits well in Kindle are ones made in Finale/Sibelius/Lilypond and written into pdf (Ej. Mutopia ones).
iPad didn't have these problems, because his LCD screen has the same of a normal laptop.
Hope this helps.
Greetings.