shower valve will adjust on pressure, if hot water side has a drop in pressure (someone opens a faucet in house) the cold side will also drop the pressure automaticaly.
Thermostatic valves will adjust on temperature. your output set point will remain the same regardless of water temp inlet.
This means if you have a 15 or 20 degree delta T set on heating device, your shower valve will fluctuate by this much after you have adjusted your infloor water temp, remember that the shower has a constant cold water temp for mixing whereas the heating system has a changing return temp (cold water connection to valve). and possibly as your return water heats up it will increase the supply water temp to floor and could create serious temps in infloor.
I hope my explanation makes sense.
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