Heatit or Warmup 4ie

Does anyone have a preference over these two thermostats? Should I avoid one over the other? Is there an advantage using an API over z-wave integration?

I understand these are the only thermostats I can use with electric underfloor heating that integrate with ST. I can get them for about the same price

http://www.heatit.com/heating-control/floor-heating-thermostats/heatit-z-wave-thermostat/

https://www.warmup.co.uk/thermostats/4ie-smart-wifi

Any thoughts are welcome.
Thanks

I’ve been using the Heatit thermostat with Smartthings for over a year and I’m very happy with it. Had a couple of occasions where it stopped responding and was resolved with a power cycle.

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Thanks. I’d read that there’s an issue with the temperature displayed is not quite accurate because of the location of the internal sensor. Does this cause you any problems?