Originally Posted by hypo

I don't know about you guys, but I'll stick with the advanced mission on this phase 1.
The gain per stamina between advanced and ultimate is small, but we get twice the occasions to pop the 50 bonus stage.

You will miss out on the Life Crystals

Originally Posted by Unregistered

You will miss out on the Life Crystals

You still get some from the advanced mission.

Just emphasizing:
This event features two types of limited equipment.

The Phase 2 equipment set has about 50 more ATK on several of its items, but with identical DEF. (At least, that's what I noticed at first glance)