Which is more rare

En passant checkmate is more rarer. People can easily eat the castle victory achievement(I have one, take a look in my profile!) but en passant checkmate is basically impossible. You need your opponent to make specific moves so you can en passant checkmate him/her. And by the way, en passant checkmate doesn't have an achievement, so it basically means 'people won't really get that, and having an achievement for it is a waste' like thing. So who agrees with me?
En'passant check mate or Castle Checkmate