I would vote for a Power Meter if you are talking about road cycling. Here is why:
- In wind tunnel tests, having an aero helmet is more important (i.e., faster) than aero wheels for aerodynamic purposes. Crazy right? Not as well known (maybe because selling wheels generates more profit than selling helmets), but this is well documented in a research performed at MIT. While on the topic, gloves are a real drag!!!
- Light, aero wheels are still a great investment for the bike, but I would get a power meter first, because in my opinion training with power indoors and out will make you faster than the aero gear.
- In addition to training, a power meter will allow you to pace yourself outdoors, gauge your efforts, and overall know yourself better as a rider.
Curious about others’ opinions on the topic!!