I think the latter movie lines gave us the best Leader Class figures.
And
Willy, why isn't this a top 5 list?
Well, it will be for me.
5.
Dark of The Moon Sentinel PrimeI just think he looks badass in robot mode. he's very faithful to the character design on screen, and he is imposing and striking with that red. Kind of a pain to transform, but that's fine because I always have him in robot mode. I gave him DoTM Deluxe Lunar Fire Optimus Prime's big red gun, since the Leader figure doesn't come with an actual gun.
4.
Revenge of The Fallen JetfireTo me his appeal is in both his combination ability, and alternate mode. I don't care for the robot mode, even if it's also faithful to the character design on screen. And he also has the same drawback as Sentinel, the panels in vehicle mode, as well as robot underside syndrome. But it's worth it, as the Blackbird is 1 of my favorite aircraft to look at, and having it be physically on my shelf is a great feeling.
3.
Galaxy Force Galaxy ConvoyA great figure of a great character from a great series. I actually debated placing him #2 behind my #1 choice, but my #2 choice is just a little better to me. But Leader class Galaxy Convoy is definitely my #2 Optimus Prime. Awesome vehicle mode, pretty good robot mode with flying upgrade. Heavy and sturdy. 1 of my all time favorite Transformers figures in general.
2.
Revenge of The Fallen MegatronI think this figure is really good in terms of representing the character, even if the transformation is simple for a Leader Class figure. He is accused of having visible head syndrome, but he doesn't qualify for that since his head is visible in the design of the on screen character. And for some reason I think his 1 gimp arm just adds to his coolness. I wish the cannon on the other arm was removable, as he does sport 2 gimp arms at certain points in the movie. Personally, though not movie accurate, I like the Shadow Command version even better.
1.
Revenge of The Fallen Optimus PrimeWhat else can be said about this figure that hasn't been said already? In my opinion, other than the Masterpiece line, this mold is the greatest piece of Transformers merchandise Hasbro has come up with. Just a marvel of engineering, I can't believe it never got the Movie Masterpiece treatment like Bee and Screamer did. Nonetheless, it got plenty of repaints and reuses, and for good reason.
Honorable mention:
Galaxy Force Master Megatron Almost the same as RoTF Leader class Megatron, his transformation is simple, yet his alternate mode is cool, even if it doesn't make sense that he's a giant race car. The jet mode I get, that should have been his primary alt mode in the series. Also as with RoTF Megatron, I liked the silver and black repaint (called Galvatron in the series) even better.
Impossible wish:
Dark of The Moon MegatronI really wanted a Leader Class figure of him, as the Voyager toy was pretty good, but the vehicle mode was too small. Imagine how awesome and imposing the Leader class version would have been, especially with an in-scale shotgun.
Impossible wish #2:
Combiner Wars Rodimus PrimeConsidering how well Magnus and the Seeker mold turned out, it would have been great to get a Leader class Rodimus figure. Rodimus has never had a Leader class figure, only the MP is a large Rodimus. Otherwise it's always been deluxes in every toy line so far. We got a Cloud Rodimus, but that's a hard-to-get Asian exclusive. As popular as MtMtE is, and as prominent a character Rodimus is in that series, they should have done what they did with Magnus and gave him a proper Leader class toy. But no, we had to get a bastard offspring of Armada Megatron and G2 Megatron instead.