I'll choose Xia as well. To get 3000 on the table is important but rely on Xia pon is too risky if we think about some one also has Xia pair in their hand. In addition, if this hand became pinfu and there is at least one ura-dora it becomes mangan. +8000 +3000 will be +11000 and the 3rd and 4th player will be unable to pass me with mangan-tsumo. This makes easier to compete(only have to take care the 2nd). Adding max 11000 seems valuable than just choosing fastest.