Thanks for all the responses (and the humorous back-and-forth between Indy & and Mesquite). Based on what I am hearing, it looks like the Alumilite is the way to go for what I am doing. Thanks again!
Well... Maybe yes, maybe no. Alumalite IS easier to thread, although PR threads just fine with a little patience. One advantage that PR has over Aluma is the depth of gloss that can be achieved.
The only way that I can get Alumalite to shine like PR is to put CA over it. Using CA over threaded pieces requires another skill set that I don't currently pocess.
While Trying to make a gloss black "kitless" pen recently, I experience this issue. The Alumalite was easier to machine, but the "gloss" factor I was after just was not acceptable. Finally I went back to PR and just took my time threading.
I suspect that this will be different in every shop, as everyone has their own favorite materials.
Respectfully submitted.