if shine is what bothers you, then think that pbt will probably will buy you more time, but if you are going to use the keyboard a lot, then it will get shinny in the end too, so I wouldn't measure by that. Focus on the lettering, and sound/feel. Doubleshots is the best, so I think if you want perfect lettering always, get the ABS doubleshot.
Personally I dislike lettering, so I would get blank PBTs ^^