The Ford is still using the CP4 fuel pump. I don't think it caused as much problems as it did in GM and Ram trucks but it would be a concern for me.
The GM puts down the least power on paper, but they intentionally concentrate on power under the curve instead of peak power numbers, so real world towing performance is pretty much on par with the other two trucks (probably not the HO from Ford).
If I had to purchase today, I'd probably lean in the GM direction but you'd have to check their seats as they are the least comfortable. They ride nice though with the IFS.