It all depends on the rules that would apply to your claim on each of these two dates. It is better not to claim your pension with a rate reduction: rate reductions are lifelong and will make you ineligible for the temporary top-up. You may be able to claim without a rate reduction once your unemployment benefits have run out if you meet the requirements set forth by article R. 426-15-3 of the French code of civil aviation, which covers this type of claim.
Should I start claiming my CRPN pension as soon as my air crew employment contract ends, or should I wait until my unemployment benefits run out?
