I prefer EmuNAND using A9LH, because, as awesome as it would be to have SysNAND booting slightly even faster, I would rather not deal with manually working around FIRM0/FIRM1 every time I update, and just update through System Settings using EmuNAND. It's faster/more convenient for updating, still has a 100% boot rate, but at the cost of a 1-2 second difference on bootup.