seems all the same with different casing, Cycplus is the pioneer and the most expensive, Rockbros/Airbank can be found bit cheaper, and the Cyclami is the cheapest, as jonathanf2 mentioned (I've got one as well but still in transit)
battery/autonomy seems equal, but I suppose that there can be some difference in the temperature each one gets to when pumping
also, the lifespan of each one can be different, but that'll only be known some months from now, when there's more time and more people using each one
in the end, I'm with jonathan, buy whichever is the cheapest