1. It’s horses for courses. The two are totally different internally - as you can see if you look. The most important feature is both measure power continuously.
2. The emonTx has only one voltage input - this is the reason for that. Robin Emley’s 3-phase diverter does measure all three voltages, and you might like to consider that, if you need better accuracy. I have no knowledge of ioatwatt, except that the accuracy claimed (when I last looked) is better than the accuracy of the sensors it uses.
3. I suggest you email The Shop and ask. The sketch is capable of very many adjustments to suit your needs (for which version of emonTx, 3-wire or 4-wire system, which inputs are allocated to which phase, what format is required for the output, etc) which require recompilation, so if the shop is prepared to pre-load it, you need to specify exactly what you need.
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