what is a big deal in this case is reliability: some of the sensors will be installed in locations where it would be an all-day trip to push the reset button, so it's important that there are no mystery gotchas in the drivers that cause the system to flake out once a week, or even once a quarter.
The big difference is that the Wiznet includes a TCP/IP stack and the ENC28J60 doesn't.
It wouldn't be that hard to do.
I am starting to be a little worried about a TCP/IP chip that doesn't support IPv6.
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