Which WET UFH system? - Low profile / retrofit

Andehh

We are having our kitchen/snug re-floore, and with that we ar elooking to install low profile under floor heating, approx 30sqm.

The house is only 7 years old, and with gas pipes running in 2 places under the floor, we are not touching the current layer of screed etc, just going over the top of it, and assuming the houses current layer of insulation will keep the worst of the cold at bay.

In short we have a choice between two systems.

One is Nu Heat's Low pro Max, which is castellated trays with a 22mm specialist screed laid over the top. They recon 120w/sqm.
http://www.nu-heat.co.uk/products/retrofit-ufh/lopromax/installation.html


The second is a 'Pro Warm' setup, of solid floor boards, with grooves the pipe sit in. You effectively glue them to the subfloor, run the pipes and jobs a good un'. They also claim around 120w/sqm.
http://www.prowarm.com/water-heating
https://www.youtube.com/watch?feature=player_embedded&v=u4EVHZFm8L0

Both would have adhesive, seperation layer, adhesive, tiles etc installed on top of them. Both are fairly similarly priced, and both companies have provided a good level of customer support so far.

HOWEVER, I am utterly torn between which one to go for. I am leaning towards the solid boards for ease of installation (my plumber/builder have never done low profile screed) and that the fibreboards will help reduce the heat being directed downwards. Also a 'safer' bet in my uneducated opinion, BUT I am wondering if there is something in the screed idea that I am missing?

Can anyone advise?

Thanks.

Andehh

Bump, don't suppose anyone has anything to add?

Really leaning towards the Prowarm's rigid boards with grooves in for the pipes. Adds an extra few mm of insulation down, easier to install and in my mind less risky then 20mm of screed.