I'd go with the strap hinges considering that you're building "stout" doors. I believe them to be stronger overall and the weight of the door will be supported by lags with the stress across the axis of the lag rather than in line with the axis of the screw in a regular hinge. In essence, hinge screws can pull out with a lot of weight on them whereas strap hinges won't let the door sag because of the way they're attached.
Just my 2 cents.
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