On 17 December 2012, the two GRAIL spacecraft ended their mission by crashing into Sally K. Ride Impact Site on the Moon. The impacts provide an important control to the LCROSS impacts on 9 October 2009. Although the GRAIL impacts have substantially lower energy and grazing incidence angle compared to the LCROSS impact, they produced vapor plumes that were observed by the LAMP instrument onboard LRO. Because LAMP also observed the LCROSS impact, and the viewing geometries were similar, direct comparisons can be made between the compositions of the vapor plumes emanating from the impact sites. LCROSS impacted into a permanently shadowed region known from neutron spectroscopy data to have elevated concentrations of hydrogen. GRAIL impacted into a hillside that is not permanently shadowed. We investigate the prompt atomic and molecular hydrogen plumes from permanent shadow and diurnally lit locations and discuss implications for the forms in which hydrogen is stored in each location.