Wa Alaikum Salam. IMO, and based on your requirements, I would suggest to go for Fielder. Its quite successful in Abbottabad, and you'll not face issues regarding spares availability, etc.
No doubt, Wish is also good, and will have benefits like 7 seaters and good ground clearance, etc., but its not "market ki gari".
Still, your choice and you may better decide based on your requirements, like if ground clearance, and that 6 people sit very comfortably, are the priorities, then Wish would be best suited IMO.
Good Luck! 