2 MCH questions

So, I've been playing MCH since Heavensward came out, but there's a few things I've been curious about, but never bothered asking.

1. Wildfire: I know it's importance in our rotation and stuff, but I've never figured out what skills contribute to wildfires damage.

2. AoE: It's more something I see in the lower level roulettes, mainly main scenario, when there's another MCH in the party they tend to use Spread Shot over Grenado. Is there a reason to use that one, or is it just that the content is easy enough to not care?

1) Everything except Turret shots, though the hyper charged debuff still effects the damage you do to increase WF damage.

2) Ultimately Grenado Shot is more time efficient while Spread Shot is more TP efficient. In other words, if the monsters won't die within 30 seconds of spamming Grenado Shot, Spread Shot will be more ideal because you'll get more casts out which is more damage in the long run when you're not running dry on TP.

Thank you, I was honestly expecting more than just my turret attacks to not work on wildfire.