I think that New Zealand is in good form at the moment, but it all depends on whether or not the Pakistan team can get adequate match practice before the series commences.
I still back Pakistan to win on the basis of a slightly better lower order. Powerplay bowling from Pakistan must be good to contain the likes of Guptill, the new guy, and the other explosiveness that New Zealand possesses up top.
I think in these conditions, Pakistan would be better off playing one more solid batsman than they normall do, perhaps someone like Danish Aziz or Amad Butt to replace one of the all-rounders playing. Management needs to decide on who to play from Shadab Khan and Iftikhar Ahmed, as the final team should not have too many spinners on tracks that are not even conducive to spin.
Final XI should Look Something Like This -
Babar Azam (c)
Haider Ali
Mohammad Rizwan/Sarfaraz Ahmed
Mohammad Hafeez
Khushdil Shah
Danish Aziz
Imad Wasim
Shadab Khan
Wahab Riaz
Shaheen Shah Afridi
Haris Rauf
Should have taken Zeeshan Ashraf to keep as it would have opened up a slot in the middle order for another all-rounder or a pure power hitter.