Which Trex is Best?

Is there a difference between these wood-plastic composite lumber products like Trex, and if so which is preferred. If not, which is cheapest and where do I buy it?
jim
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Consumer reports did a review a while ago, as well as Fine Homebuilding magazine. good places to start your research.

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Thanks. Based on your lead, I've now located the Consumer Reports article.
jim
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One major difference between the brands is whether they can mount on joists that are 16" on center, or need 12" on center. Trex IIRC requires 12". I did find one brand locally that used 16", this was quite important for me since I was using the existing deck structure (which was 16" O/C). If you are building all new, 12" just adds a few extra joists which may not be that big a deal.
Most of the rest is up to you, what you want for finish, texture, colors, etc.
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