As Russ has mentioned, personal taste/lifestyle do need to be factored in. Personally, I've done a fair amount of research and am going with a Trex type of material. It really has improved over the years and I know that I'l appreciate the low/no maintenance of Trex.
I've had a redwood deck and found it to be too much work!
Cheryl Bower, Realtor , GRI, ABR
Zephyr Real Estate