As the tittle mentioned,i will be posting the pros and cons of this two cards.
Pros:
-Choose card which fit the situation you are in.
-Faster than Fragment of Greed
Cons:
-Can be stop easily by Thunder king raioh
-Unable to special summon the turn you activate duality
One of the best card in game,allowing to choose 1 out of 3 cards that you think is the best which
will help in that situation at a cost of unable to special this turn.
Next,we have the new pot of greed from photon shockwave,Fragment of greed(FoG)!
Pros:
-Draw 2 cards
-Lure opponent cyclone,thus protecting important cards such as solemn judgment,oppression
-Raioh cannot stop this card
Cons:
-Need to wait for 2 turn
The new pot of greed is so awesome!Its a United that can be splash into any deck.Force opponent to cyclone FoG or else you can draw 2 cards.
To sum this,FoG can be cyclone while duality can't.However duality can be stop by raioh but cannot stop FoG.Control deck play Fog while Fast deck play Duality
*Edited*After a test between duality and FoG,I prefer duality as it is faster compared to waiting for 2 turn
It is your decision to decide which card suit you.