I have only got to level 20 so far but the class story for SI is very predictable and I am already sick of dusty old tombs. or sludge filled tombs and the Tomb Raider death falls which always accompany places where priceless artifacts have been left by accident. BH I found to be more enjoyable.
^ do bh. If you like to be somebodys *****boy then go SI. Literally you go and find random artifacts in random tombs that you dont give a rats *** about.