Maestroke vs. Utopia: Who Wins?

I'm having a real hard time choosing between whether I should use Maestroke or Utopia. What do you guys think?

Maestroke the Symphony Djinn
Rank 4
ATK 1800
DEF 2300
2 Level 4 monsters
Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up Attack Position monster your opponent controls; change it to face-down Defense Position. If a face-up "Djinn" Xyz Monster you control would be destroyed, you can detach 1 Xyz Material from that monster instead.

Number 39: Utopia
Rank 4
ATK 2500
DEF 2000
2 Level 4 monsters
When any player's monster declares an attack: You can detach 1 Xyz Material from this card; negate the attack. When this card is targeted for an attack, while it has no Xyz Materials: Destroy this card.

Post below with your thoughts!

i prefer utopia honestly because it stops most aggro decks