I have added both to my list of podcast listen to. Already listened to StoryArk and love it. GM showcase is next in my queue and I'm sure it will fabulous. Thanks guys for putting out such wonderful podcasts.
Story Ark is great to inspire ideas, but also just entertaining purely as a listener. I suspect more variety in content-but with the same polished delivery is on the way!
GM Showcase is entertaining, and serves as a good example of how games can flow, game pacing, balance rules vs story etc the first few eps highlight the gaming skills and styles of some of the DMB Usual suspects
also I use the GM Showcase as a benchmark to aspire to-for recording and producing my own D&D sessions
Wish List : I hope with GM Showcase they get former GM's to return say 6-12 months later, do another game to either continue the old story, or do a different part of the world, or a different style/genre in their game.