Binding event attributes

What is your preferred way to bind event attributes? Here’s an example comparing two techniques

I’ve typically used event attribute binding in the eventex when I need it for use in the eventex and use binding in the pre block otherwise.

But that’s just personal preference.

One function difference: if you bind in the eventex as shown the rule will not select unless the capacity and token attributes are present, whereas when binding in the pre block the rule will select whether the attributes are present or not.

So use the first if you want to require the attributes and the second if they’re optional.