it's illegal to fly at night in a single in France
It is illegal to fly a single at night in France
Who said that? I cant see the post. You are wroing in any event.
I wouldnt want to have an engine failure in a SEP at night because there is a lot more luck involved in the outcome that during the day - but if you review the engine failures at night a surprising number are successful. My mate had one going into to Redhill not that long ago and was absolutely fine if a little shaken.
For that reason give me a twin any time at night - but as IO says a knackered twin with little single engine performance might not be a lot better. On the other hand a good twin will take an engine failure at night and the night landing in its stride.