Luma's updates are A LOT more constant than RxTools, hell RxTools is dead. Both have AGB FIRM and TWL FIRM patched, but Luma is A9LH supported while RxTools isn't. I'm not sure if RxTools is region free, but Luma is. And Smash3DS does work with Luma, A9LH or RedNAND/EmuNAND.