5 yr ago I would have said the same and secura had superior fittings with swept bends etc - but they no longer do - now i do not think it really matters - alot of composite pipes are actually stronger than many metals especially alloy's - copper brass etc - I have not seen may failures by one or the other - the alloy on bute can become brittle when exposed to the elements for a period of time but that is due to poor installation - they had a period for a while where some fittings were failing straight out of the bag but that was rectified quickly - much of a much-ness IMHO - anything but fusio!!

Not an expert, but I much prefer the copper crimp rings to aluminium. Ali just doesn't seem the right material to last 25 or 50 years. It's soft, prone to creep, readily corrodes - just doesn't seem a good choice. On top of that, I like the so simple view holes in the crimp rings, that allow you to confirm that the pipe is pushed home. Under a house, on your back, trying to re-join two already installed lengths with limited space and poor lighting, while fighting with the long, wide opening handles on the tool to get enough space to actually make the crimp and get the end seated into the socket all at the same time can be a challenge. It's nice to be able to tell, after the fact, that you got it right.

That said, I've found Dux extremely frustrating and difficult to deal with. They have a good product, but they seem to be their own worst enemies. I can see why Buteline seems to have cornered the market. Efficiency, and good service. Dux tries very hard not to be actually helpful, if you ask me.