They're basically the same thing with one caveat: Voyager integrates the wings into the shins while the Leader's are a backpack. Admittedly, the backpack looks like a nifty shield but still. Also depends on whether you want an Optimus to go with it in which case, Voyager Optimus is waaaay better.
The leader also has the facemask gimmick
Oh, also, the voyager's cannon is integrated into the transformation and a part of the fuselage while the leader's is the removable nosecone transformed
Edited by unluckiness, 23 June 2017 - 06:54 PM.