I know that. I'm just looking for opinions.
Okay, subjectively speaking, I like the interface of X5II better, I can also modify it, and I really trust the front wheel on X5II more than the volume wheel on AK JR.
Another complaints would not exist, they seem both as like-able devices, I would stick to Fiio, gives more options, (LO, Coaux Out, dual microsd, good amp built in, buttons seem reliable, ports seem reliable, zero background noise)
AK jr has way less battery, and has wolfson DAC inside (me not like) (you might like wolfson DACs, they are warm, natural sounding, but X5II's DAC is neutral and flat, which is more ideal of a DAC to be).
AK jr seems thinner, so I guess that this is why the built in amp is weaker, it seems that the swing voltage is higher on X5II (not sure if this is a characteristic of how it will sound from the start).
I cannot fiind anywhere if the power of AK jr is stated, but X5II has an amazing 436mw in 16ohm.