Safety grab was easiest for me

I just learned how to do a blunt 3. A blunt grab is a pretty simple grab to get. If I'm doing a left blunt grab, I'm grabbing the outside edge of the left ski with my left hand toward the tail of the ski. I spin left so I tend to do left blunt natural 3 because my eyes are looking toward the landing while I can see my ski in my peripheral also. So twist your skis right while your upper body leads left.

Just start with grabs that go natural with the rotation. Reaching the way you spin keeps the spin going easy, so any grab where you reach the way your spinning works.. For 360 probably blunt/tail/safety, depending on how much air you have.

I started off doing mutes, since they made me land forward in my boots. If you spin right, crossing your right ski over your left and grabbing with your left hand would be trailing, and would cause your spin to slow down. Then left over right and grabbing left ski with right hand would be leading, and would help spin your rotation up.

Saftey

I learned safety first. It was the easiest for me because I was already practicing my 360s with safety grab on flat ground. So when I did them on skis I would instinctively grab safety to keep balance while in the air.

What ever grab your most comfortable with probably a safety

Safety grab for sure

Where ever you hands usually go