Well, for one thing, WINE CONDOM(s) are convenient, disposable, and HILARIOUS!
What? That was three things? Well here's another thing: WINE CONDOM(s) sit flush with the rim of the bottle. That may not sound like a big deal, but you'll appreciate it the next time you try and store an open wine bottle in your refrigerator.
Most wine stoppers on the market sit 1/2- 2 inches (or more) above the wine bottle rim. The added height causes the following storage syndrome: "Pain-In-The-Ass-Leans-To-The-Side-Which-Never-Quite-Fits-In-The-Refrigerator" syndrome.