Favorite mob... hm... Frescoquda.
Takes some shots depending on the gun. The best would be killing without fapping on the middle, up to guardian I kill them relativly fast.
Its fun but I'm not efficient killing them skill-wise/gear-wise.
It takes a lot of time, but all the times I hunted them never got sick of it.
The actual mob im hunting its formi/furor. those I find boring using always the good-old p5a. and it takes me 25 shots on p5a~ to kill a formi 40~ furor (reload of p5a is 52)