There is a lot of diffrence between informatica an Ab Initio
In Ab Initio we r using 3 parllalisim
but Informatica using 1 parllalisim
In Ab Initio no scheduling option we can scheduled manully or pl/sql script
but informatica contains 4 scheduling options
Ab Inition contains co-operating system
but informatica is not
Ramp time is very quickly in Ab Initio campare than Informatica
Ab Initio is userfriendly than Informatica