Well, I for one cant get the HBtrain to work (Standing at flightmaster forever), and from previous trys I havn't yet to experience a fully working eTrain eighter, so I guess neighter is the choice to make at the moment ^^
It walks to the closest trainer regardless if this trainer can teach you something new (level of the player) or it would have been faster to fly there And on lower levels you have the problem that you might end up without money at the trainer because it didnt sell goods (which could also bee not enough to buy skills)