from working at a trucking company with a independent shop that services fleets , I can say Isuzus are good ( only thing they come in for is oil changes and brakes , we had a few major problems come in ( blown engine, but it was driver caused (wrong gear Engine braking ) not product and some transmission linkage problems gorilla shifting )
the mitsu's they send to the dealer ( they will not touch them like some Ford products , let the dealer take care of there mess they made ) and parts availability was another issue , the true old fuso (pre daimler-volvo ), were good according to the one mechanic it took volvo and Daimler to mess it up .and then ceribus to really screw it up
as for the Hino vs Isuzu , thats a tough call , Hino been around for years and body rust is what ussually took them off the road ( if you could drive without a cab they would still go ) there engines are top notch .
Isuzu helped Gm design the Duramax ( it was Isuzus design , GM built and then bought the rights to the motor ) and now Isuzu builds Gm's Mid size trucks since they got out of the market . ( GMC has carried there trucks for years before this with good results ) .
If it was me I would do Hino Vs Isuzu , and see which dealer is wanting to kiss up for the least amount of money . because either or your going to get a good truck , . also it helps to find a salesperson who only deals with trucks , not a car guy otherwise they might sell you a truck thats not rated for the job . ( seen that happen many times with Pickups and medium duty )