Dawn Giant or Xeno Mantis

[Necro-M]

Dawn Giant or Xeno Mantis? Which is better?

Dawn Giant is huge at 11000 but cannot attack creatures.
It can, however take out two shields.

Xeno Mantis is only a 6000 but cannot be blocked by any
blocker less than Szubs. It also can take out two shields.

Neither is really good in a non-control deck. So here's my question.
Which is better given that you have blockers and can deal with
your opponents blockers? Now if you play Xeno Mantis as the kill
condition you can ignore all those little walls. Or you can
smash through them. The slowness of Dawn Giant might give
an opponent time to dig up an answer. But, now with Volcanic Arrows,
Xeno Mantis is more fragile than ever. What do you think?

[Vuchato]

I prefer Xeno Mantis. maybe because if your opponent has any blockers, they probably won't be big enough, and Dawn Giant will be chump blocked all day long, and with volcanic arrows if they use it you still kill off a shield, or if you use Xeno Mantis, You basically payed 7 mana to send two of their shields to their grave and one to their hand.