Neither causes leaks...well if you use it correctly that is.
Anyway you need to realize that most of the things done in the editor are in fact put somewhere inside the jass script...
This goes for the cameras as well - placing one results in adding a line somewhere that creates a camera and makes some generated variable point to it.
In other words its the same thing. Triggering it looks clearer from my perspective, but this is just an oppinion.
Use the thing you like better.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.