In your opinion, if there was a Falklands-style situation
today, which would be in a better position to handle it : France or Britain ?
Depends.
Without any external assistance:
If they had a strong air force, the Marine Nationale. (Because of the carrier and the Rafale, since the RN retired its Sea Harriers; before that, only problems when fighting a fairly large and modern air threat.)
If they had a strong submarine and surface fleet, the Royal Navy. (Not saying the French couldn't prevail, just the RN is better equipped for it and more experienced.)
Both have near-enough the same number of decent first-rate ships and amphibious craft. The French win on aviation, for the time being, but the UK wins on having far better and more capable submarines and (overall) better equipped warships.