Replying to PVC rail Vs Composite deck rail.

I'm starting to do some designs for this winter and I have the ability to get some composite deck material really cheap. In the past I've tried PVC and Steel bar rails. Steel is heavy and hard to work with not to mention really bad for your edges. Will someone who has used both please explain what they like or dont like about either PVC or the Composite Deck material. Thanks

Off top of my head

PVC - really slick / Prone to cracking (if you screwed through the bottom could end bad.) / 10 ft lengths / hard to bend / need lots of support / cheap

Composite wood deck - bends easier / less support required / wont crack / ???