No shots to duck!
While I think that Riesling Sekt can be excellent and I love it for the same reasons that I love Riesling kabinett (primarliy because it is delicate, floral, and delicious) and I feel that well-made versions can be more interesting and more 'serious' than Prosecco, there are other grape varieties probably better suited to complexity in sparkling wine (if that is what the occasion calls for). Lately, I've been really impressed with Pinot Blanc as a medium for bubbles and I've never refused a glass of Pinot Noir Rose Champagne/Sekt.
Somewhat related: On Friday afternoon, a very large Boar ran into the Schloß Wachenheim Sektkellerei (located in Wachenheim between Bürklin-Wolf and J.L. Wolf). The 180 kg and 1,7 m long Boar broke into the tasting-room there and started knocking over display racks, breaking bottles and turning over tables. The woman working the counter ran out, locked the door and called the local boar-hunter who came in and shot the beast in the store. Clearly a Sekt-fanatic, he might have taken issue with your statement about sparkling Riesling not being as good as Champagne...perhaps he will be eaten alongside a glass or two.
But, yeah. My favorite grape? Riesling. no doubt about that.