If you are going to the city anyway, the HP is by far the most convenient option. That is unless you want to go Uber/taxi into the city (which I wouldn't as it doesn't save you any time).

As the HP is directly at the train station Gateway Gardens, the total amount of walking between terminal, hotel room and train will be minimized. You will have to do a lot more walking if staying at the Hilton or HGI (which are close to the long-distance train station but far from the local train station) and somewhat more if staying at the Marriott or Sheraton.