H616 won't be supported by LE for a long time. Two main issues - no proper audio driver (very hacky hdmi audio driver exists, but I'm not willing to maintain used hacks) and bigger issue display driver is not good enough (it lacks support for YUV format and scaling, which is essential).
H6 is arguably better for LE:
- it has power management coprocessor, which can be programmed and supports many ways for powering up or resuming from sleep
- it has USB3
H616 has following advantages over H6:
- better GPU, but LE doesn't use it much aside for drawing GUI and some addons
- supports 4 GiB RAM max, while H6 only 3 GiB max. But that's not big deal either