Not all aluminums are the same, and definitely not all composites are the same.
Cheaper aluminums (5000 series) are less durable but more bendable. Higher end aluminums (6000 and 7000 series) are way lighter, more durable, but less bendable. A good 7000 series pole is tough to beat.
Composites are arranged in terms of their carbon content and construction method. The Swix Mach CT-1 (which Jon, even though he has a different pro model, and tons of other pros ride with) is one of the (if not the) strongest poles available. It is super light and there is absolutely no flex to it. If you drop the $250 for it, you will have it for a long time.
Cheaper composites have less carbon in their construction and more fiberglass- these are the flexy poles. K2's 3-Speed is mostly fiberglass (probably 80% glass, 20% carbon) and is super flexible on purpose.
So, ask what series aluminum the pole uses and ask what the carbon/fiberglass content is of composite poles. It will tell you a lot about its durability and stiffness characteristics.