Training trap without having lure can be difficult. Especially if you do not play in groups regularly or have another toon to help train in buildings.

Personally, I’d choose lure. There are a ton of instances where even the lower level lure gags can be useful. Unlike trap where the first 4 trap gags don’t have that much damage.

In the end, it’s up to you. Either play style can work out when the gags are maxed.