I got the pipe sample last night Ridge, Thank you. The pipe looks to be good quality but these are some differences that I see.
1 Pex is 1 inch nominally sized on the Reheau (outside measurement) and metric 1 inch inside on the Logstor
2 The foam appears with a naked eye to be a bit different, not sure which is superior, I would have no issue with the insulating value of either.
3 The Logstor has what they call Smart membrane adhered to the black plastic exterior cover, between the cover and the foam, Logstor says this helps to protect the foam from gassing off in the future, I do not see this in the Reheau
The Logstor is about 1/4 inch wider on the outside dimension.
Conclusion, Either could go in the ground on one of my installs, If it's up to me and not the customer to make the choice from a $ standpoint I'm going to use the Logstor because of the Pipe size and added flow