I dont have any experience with the kit, but the 50AE would have the edge. The 50AE case is the same length or just a tad longer that the .44Mag case. The 50GI is the same or a couple thousandths longer then a .45ACP case. The 50AE has the 50GI out classed by a pretty stout margin.
Desert Eagle 50AE
325 gr Ball 1,305 ft/s 1,229 ft·lbf
325 gr JHP 1,400 ft/s 1,415 ft·lbf
300 gr JHP 1,550 ft/s 1,600 ft·lbf
50GI Out of a 5" gun.
185gr SCHP 1,200 ft/s 591 ft·lbf
230gr SCHP 1,000 ft/s 510 ft·lbf
275gr JHP 875 ft/s 468 ft·lbf
300gr TMJ 700 ft/s 326 ft·lbf