The Glow Thundy is MUCH more high speed stable. It doesn't turn, at all.
I'd love to see the Thunderbird in the production glow champion series. Just like they've done for the Wraith, Valkyrie & Roadrunner. I hope that line continues.
Like these:
http://www.discgolfcenter.com/main_displayProduct.php?p=7&PPQT1=383