my blue jaw was a sweet heart. he never once ever tried to go after my hand. he got along great with tank mates. as for the other two, i have never owned them. my best friend owns a pink tail (my second fav), and he was an aggresive eater, but never took a bite of the hand that feeds. sargasim triggers are a little more tricky to acclimate and get eating, but once they do they make a wonderful addition to the reef.
my fav (as stated before) is the blue jaw. in nature it is a fish that eats zooplankton from the water column, making it a less aggresive fish towards your shrimp and smaller fish. i would suggest this trigger over the others.