One would have to be unusually weighed down with luggage to count the tiny distance difference between the Ibis and Hllton as meaningful. And from the RER station, they are almost the same. Moreover, Hilton offers a free shuttle with luggage assiatance, making the distance question moot.
Two very different hotel experiences-Ibis is cheap and has what you expect at a cheap hotel. The Hilton has top notch amenities and offers a quality experience.