I preferred ReiNand to Luma back when I used Menuhax, the boot rate was way better with Rei than any other CFW at the time. The short time I used Luma with Menuhax, when I was going through the guide, I suddenly understood why Menuhax got such a bad rap, it took like 10 attempts to boot into Luma EmuNand where Rei would take a maximum of 3.
Definitely upgrade to A9LH at the soonest convenience though. Believe me, you won't realize how much better it is until you have it.