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For a small light truck I'd go with the narrower/lighter tire, even though it will put your overall tire diameter slightly larger. The combination of taller and narrower should help your highway mileage and anything that reduces your tire/wheel weight helps city mileage.
What you don't mention is the load range rating or the maximum inflation pressure rating. I assume that you will be inflating your tires to their maximum rating to reduce rolling resistance. LT tires come in different load ranges (C, D, E) and each typically have different maximum inflation pressures. If one tire can go a bit higher on inflation than the other and you think you'll be able to tolerate the ride harshness then go with that tire.
I went through the same decision not long ago on whether to get an LT tire or regular tire in my truck's stock 265/70R17. I went with the Hankook DynaPro AS RH03 passenger as opposed to LT because the LT tire was almost 10 lbs heavier EACH. The passenger tire in that size is rated at 44psi vs. the LT tire's 80 psi. I thought the large weight difference would more than handicap the additional air pressure for no net FE gain but large ride punishment. Combine that with the fact that Hankooks in general are hard to find here, and the LTs were completely not available, so I went with the passenger model. Before that I had a stock-size BFGoodrich LongTrail T/A, which was another low-rolling resistance model, and saw no change in FE. I like the ride, grip, and especially the wet handling of the Hankooks better than the BFGs.
BTW checking the Hankook site today they list the DynaPro AS RH03 in a 225/70R15 in passenger, but not LT (they do have the LT215/75R15)
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