Original PS2 Is The One Which Only Reads Original Game Disks
WHEARAS
Modified PS2 Is The One Which Reads Original As Well As Local Game Disks,But It Is A Crack Of PS2 So You'll No More Be Able To Watch Videos,Movies In Your Modified PS2..
But If You Want PS2 For Just Gaming Go For Modified One,I Used It For 3Years Still No Problem In My Own Experience....
And Local Disk Costs Very Less Than Original Ones So You Can Get More Games With It....
GAMES YOU MUST PLAY:-
1)Resident Evil 4
2)God Of War 1,2
3)NFS Carbon(If You Love Racing)
4)Prince Of Persia(Series)
But If You Have More Budget,I'll Recommend Getting An XBOX One Or PS4,That Awesome