So in a nutshell just go for Armloader9 with Luma CFW honestly I don't think anything will ever top that. You will gain more user benefits that way and its free.
Gateway was more like a blueprint to make 3ds roms possible now we have accomplished that and more its an outdated cart at best. Only cart I would reccomend buying is a DSTWO Super Card to play/emulate NDS,GBA,GB/GBC,NES,and SNES roms its more useful than Gateway including their cloned blue chip which is a rip off copy of DSTWO. I use that cart along with my permanent CFW New3DS to make it the ultimate Nintendo handheld
Gateway was more like a blueprint to make 3ds roms possible now we have accomplished that and more its an outdated cart at best. Only cart I would reccomend buying is a DSTWO Super Card to play/emulate NDS,GBA,GB/GBC,NES,and SNES roms its more useful than Gateway including their cloned blue chip which is a rip off copy of DSTWO. I use that cart along with my permanent CFW New3DS to make it the ultimate Nintendo handheld