Can't decide, Best quality Selkirk or Duravent Chimney

I remember when I was just a wee lad in my early twenties some 35 years ago and Selkirk metalbesto's was the only chimney pipe one could buy. Now Simpson has entered the picture with chimney pipe. Before that Simpson's claim to fame was metal joist, roof, rafter and post hangers(can't sag line) and their Truss type floor joist called T.J.I.'s.
I never had a problem with the Selkirk Metalbesto's and that was in the day when combustibles could be put against the pipe although fire experts always advised a 1" space between pipe and combustibiles. Also it was advised that insulation be placed up tight to the metalbesto's pipe. I never had a house burn down yet, althought I've only done 5 or 6 easy installs with shingle roofs, close to the ridge or with a masonry thimbal already there.. I was only a journeyman carpenter then and some customers were so enamored with our crew, that they wanted us to do all the work. So we did it.

I was particularly drawn to the explanation of the duravent chimney insulation construction and how it responds and keeps it's shape during a chimney fire. Perhaps Selkirks does the same thing, but they just don't spell it out. After all they have had some 40 years to perfect their pipe. I think the Selkirk is cheaper and sold a Lowes while the Simpson Duravent is somewhat more expensive and sold at Home Depot.

Any comments? I want to buy my pipe from a dealer with the fullest line in stock and of coarse it must be safe in a chimney fire. Selkirk or Simpson?
Thanks Joe

Almost sounds like the Selkirk rep is skirting the issue of solid pack insulation settling vs Blanket type insulation in the Simpson line. That issue would be a major break through for Selkirk, and i would think their AD men would jump on that piece of positive news and squeeze it for all it is worth. I also think it would draw many more solid fuel burners to the Selkirk line. So why wouldn't Selkirk publish and embellish those results? They are a multi million $ corp or maybe even a billion $ corp. So keeping their tests out of the public eye makes one think that that Selkirk is being not completely forthright. I do think I still might go with the double wall Simpson Duravent lin sold Home Depot. Only because it is sold at more places and merchandise is easy to return there.
I have used Selkirk in many of my stove installtions, but none has had a chimney fire, as I try to burn wood intelligently and keep the chimney clean. I have never had a problem with Metalbestos products. So In all fairness to John V.P. at Selkirk we should hear what he has to say.