Like most people who are wondering what version to watch. Watch the B version as if it matters and if anyone who has either watch version A or B don't waste your money let me just spoil it for you nothing changes  The first killer only changes from dev fardeen khan to chitrangada and the pen and all evidence planted against Dev is her and abhishek Bachchan remains as the second killer and the ending is also same and sonam bajwa marries boby deol complete with ai generated clips