This will vary from skater to skater, but in general, most skaters will tell you that Fakie Big Spins are much easier to learn than 360 shove-its. This is because the backward momentum and the body varial involved in the Fakie Big spin all work in your favor to make the board turn the full 360 degrees. However, when doing a 3-shove, the skater has to generate all of the power to rotate the board from the scoop alone. So with this in mind, we would say that 3-shoves are definitely the harder trick here.