It's pretty difficult to compare aero helmets and cuff links. One protects your cranium while riding a bicycle, the other holds your shirt together at it's sleeve cuff. While wearing one you hope to break a sweat and get in a good workout. But while wearing the other you hope to avoid sweating at all costs. One is pretty good size and is very apparent when seen. The other is much smaller and doesn't stand out quite as much. Of course there are many more differences that I choose not to go into here because the point of this post is how they are similar.
Aero helmets and cuff links are very assuming, in my opinion, and both make a statement. An aero helmet does more than just protect your head in a crash. It's there to make you more aerodynamic, more streamlined, faster! Cuff links do more than just hold your cuff together. They're more sophisticated, they say something about you.
Both aero helmets and cuff links force you to step into an arena where casual is no longer an option. It's serious now and you're playing for keeps. For the helmet not only are you preserving your health you're saying I'm fast and I want to be faster. For the links not only are you keeping your cuff together but you're doing it with a certain pizazz.
O.K. Now comes the self realization. I have both an aero helmet and cuff links. I guess that makes me all that's above with certain caveats. As far as the helmet's concerned I'm really not that fast I just got an incredible deal on it and couldn't pass it up (more than half-off!). And the links? I got a good deal on some french cuff shirts. How are you going to hold them together without links?
Here's another difference between the two. With cuff links you can kind of pull it off. If you look good, who really knows the difference? But with the aero helmet if people are blowing by you like you're going backwards they're going to go, "yeah, right!"