Can someone explain to me the difference between these two different fast vaults?

I've been playing DBD for a while now but I've never learned what the differences between these two fast vaults are. One animation looks like a normal vault, but fast. The other has the survivor swing their legs over the ledge. One of my friends says the first vault feels slower than the leg swinging vault, but I can't tell if it is.

Is one actually slower than the other? Is the only difference the animations?