all white bags (lamb/patent/caviar) will transfer color easily,
white caviar can remove most color transfers,
lambskin attracts dirt even when your not carrying it but if you like white I'ld go for it,
aged lambskin, distressed, calf are relatively easy to care for,
keep in mind white leathers bags will most likely yellow with time and use (not a few years but maybe 10 years + later)