I actually like nnnnnn & ffffffff & dddddddd &
*keyboard smash*
I use them all, whichever feels right in the situation, and idk what makes each one feel right I just know I use each one in some kind of different situations lol (like I think I uuusually lean towards nnnnn when it's more on the ****ed up side of funny

)
I think I like it because it feels kinda real-life esque as well. Like I'll make an fff sound or some other random sound when something's funny but not enough to all-out laugh about.