That's a tough decision. I've heard a lot of gripes about both. Both of them would have enough power for your occasional towing needs. It's just a question of how often it will be in the shop. Maybe you should get the one that is cheapest to get parts for. Or get an older truck for towing and a commuter car for your other needs.
I'd check Consumer Reports or something of that nature.
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If anybody needs me, I'll be on the river.