@ender said:
I never liked FoxIt reader, because despite launching much faster than Adobe Reader, it was always much slower rendering complex pages. Since I usually start a program once, and then keep it in the background, those few seconds at startup mattered much less to me than the ability to quickly scroll through document. I did replace Adobe Reader with PDF-Xchange a few years ago though.
I use pdf.js (the Firefox built-in one), my Mom and grandparents use Evince, and my sister uses SumatraPDF.