one easy question, one a little more subtle

It's AnnoDomini's turn and he has two choices -- take my 4-sided die with his 2-sided die, or take my 6-sided die with a skill attack.

If AD chooses option one and I am forced to take the 2-sided die on my next turn, which die should I use? [that should be an easy question]

But is that AD's best chance of winning? would it make more sense for him to do the skill attack?

Game #20987  •  ElihuRoot (Oni) vs. AnnoDomini (Rhode Island)  •  Round #2

Reverse

Opponent's turn to attack

(4) (10) f(12) f(12) (V) Button: Oni Player: ElihuRoot

W/L/T: 1/0/0 (3)  •  Score: 24 (+2 sides) Dice captured: (4), (4) (4) 2 (10) 8 f(12) 12 (V=6) 4 1 d(6) 2 d(10) 2 (R=2)  1  (4) Dice captured: f(12) W/L/T: 0/1/0 (3)  •  Score: 21 (-2 sides)

Player: AnnoDomini Button: Rhode Island (4) (4) d(6) d(10) (R)