For new racers looking to buy a set of chainrings, I highly recommend FSA Pro.
https://www.retro-gression.com/colle...rack-chainring
They are high quality solid disc chainrings that will last several seasons. They are by far the best bang-for-the-buck chainrings at $55/each.
You can get a complete set of 6 FSA for what you would spend on 2 Zens.
Yes, all of the pros ride Zens, but Zens cost nearly 3x as much (seriously).
Both have the same disc shape which resists flexing (and even bending by stronger riders). Bending is why you don't see Shimano Dura Ace rings being used by big sprinters.
What's the difference?
Zens go through an extra 5 steps where they machine out the rear to literally shave off some weight:
Front:
Rear:
If you are a new racer looking to expand your kit or an experienced racer looking to replace worn chainrings, I highly recommend the FSA Pro. They are
very slightly heavier but solid as a rock, last a long time, and are a great value. I've seen them in the pits and on bikes of elite international events.