GRAND vs CANVAS HD
never go for numbers......its all about the user experience.....i am having both device for use (i own HD an my sis use GRAND) purchased within weeks...so as per my experience i can say CANVAS HD is better than GRAND in most of the fronts except camera and GPS (btw who use GPS on daily basis ???).... Grand is laggy as comapare to HD and most of the S features are just gimmick (rarely use,consume more battery)
My canvas HD is still smooth ...never face any lag while playing games (shadowgun,blood and glory,dead trigger,virtual tennis and lot more)
Grand do have samsung brand name with it but that brand name cost you 4-5k more.