I have the sump, and two of the gadget factory ones. The sump has more features, the GF one is cheaper.
the software basically the same, i use the omla so i have 5V on the sump, and it works quite well.
the GF is in active dev, where the sump is more spotty, however theyre mostly compatible.
i do often jsut end up using my intronix since its simpler and the software is better,