Since, (Triggering unit) is on the top of the list of Event.
The system always refer (Triggering unit) first, before any other, which will performs faster and efficient
We can't pretty much see the differences, but trust me, it IS different.
But we can't use (Triggering unit) as (Killing unit), but we can refer it to (Dying unit) in an Event such as "Unit - Generic Unit Event" -> "A unit Dies"
Basically, in an Event, it has 2 thing, which is A and B
A would be likely to be the (Triggering unit) whereas B serves as (XXX Unit)
Situation A:
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Unit - A unit Starts the effect of an ability
The initial word which is the "A unit..." refers to (Triggering unit) whereas the connection of this Event would be (Target unit of ability being cast), right ?
Situation B:
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Unit - A unit Finishes construction
"A unit..." refers to (Triggering unit) whereas the connection of this Event would be (Constructed structure)
We can also use (Constructing structure) as (Triggering unit) but it works faster by using the (Triggering unit)