First I've heard of it, so I did a little homework. Their Hose Plus 38 appears to be Thetford's "me too" version of Raritan SaniFlex
Raritan Saniflex Sanitation Hose Vetus sanitation hose also looks very similar, but that doesn't necessarily mean they're all the same hose. The Tecma PVC HoseHelix 38 seems to be a "me too" version of SeaLand OdorSafe hose (if it's even that good). They're all made in Italy, though I'm not sure whether all by the same company. Vetus is a European company...Tecma's roots are in Europe ...so I have a strong feeling that the US marine market won't be the primary market for Tecma hoses... We'll see.
I tend to go with track records instead of sellers' claims. Trident 101/102 and Raritan SaniFlex continue to have the best track record so that's what I'd advise you to go with.