I was annoyed with the idea of the automaton Trusts at first. But now I like to run around with both of them on PUP, so I have 3 pets! (sort of) You can't control them and the RDM one doesn't cure you, so eh .... I don't think players with these Trusts are suddenly replacing Puppetmasters.
I would totally go for Achtelle and Bravo as Trusts. I doubt the wyrm would heal you, and since most Trusts are pretty weak, this wouldn't replace DRGs either.