I read about the event and come up with this (Some thing might be wrong):

If you build a Moe deck you will try to attack Sexy players all the time and you will be attacked by Babe players almost all the time.

If you build a Sexy deck you will try to attack Babe players all the time and you will be attacked by Moe players almost all the time.

If you build a Babe deck you will try to attack Moe players all the time and you will be attacked by Sexy players almost all the time.

Moe decks with 5 strong Moe Cards will gernalely be the stronges Moe deck when attacking but very week in defence.
Moe decks with 3 strong Moe Cards + 2 Sexy cards be weeker in attack but strong in defence.
Moe decks with 4 strong Moe Cards + 1 is between the 2 other moe decks. This is a good deck if you dont want to change deck between each match.

If you attack a player with strongest defence (3-2) you should proberly go to strongest attack (5-0)
If you attack a player with medium defence (4-1) medium attack (4-1) should be enogth
If you attack a player with week defence (5-0) week attack (3-2) should be enogth
You cant see which of the 3 defence mode defender are using before attacking.

Only advantage of Moe is that you need need to level Moe girls up so much before getting high power levels.
So new players might have a small advantage by playing Moe.