^ I do not have much R2 discs to answer your question sir.
But in my collection, R3 Columbia picture DVD's in clear SCANAVO cases have rotted the most.
(Lawrence of Arabia 2-disc, Bridge on the River Kwai 2-disc, Bram Stoker's Dracula(superbit), Bad Boys and Kung Fu Hustle 2-disc) :'( :'( :'( :'(