Any recommendations, preferences or advice between the two. Primarily for Sept CO elk hunt but would like to use it other times as well. Thanks

Anyone?

I have the downpour but have not tested it yet. What's the difference between the cloudburst and dew point?

Both are great jackets, i have the cloudburst and like it alot. If you wanted to spend a few more dollars the coldfront is the best all round jacket it will last you MANY years bomb proof they should call it the 100% jacket

Best of luck

Another option to look at is the boundary jacket by first lite.  I've been using mine for about a year for hunting and work and am still very impressed.
Between both of the sitkas, I'd also go with the cloudburst unless you're really worried about weight.