The ROTF Leader Megatron is I believe a better overall figure. He looks quite good in both forms and the inaccuracies weren't really they're fault, they were working on the designs they had been given before he got a design overhaul. He also does not have ANY kibble in either mode (the visible face is intentional, as it was originally going to be the movie and it can be easily covered anyway).
I'd say wait for the DOTM Voyager, which by the looks of things is going to be the best of the Movie Megatrons by far. ROTF Megatron looks good in Tank Mode but the Robot Mode's HUGE backpack isn't something that can easily be looked over. I mean, it's not a kibble backpack, it's a MONSTER kibble backpack.
Seriously, just look at that thing:
http://www.seibertron.com/transformers/ ... 1891/1/44/Also, his robot mode accuracy is also damaged by the fact that his missile fires from his hand rather than his fusion cannon which is just... Weird.
In comparing all the Megatrons, ROTF Leader Megatron is not the best figure ever, definitely the second weakest leader just a bit better than Jetfire, I still think its better than the Voyager. The DOTM Voyager, however I think is worth waiting for. Especially considering the fact that there are no promises for a Leader Shockwave and its the right size to be displayed with Voyager Fallen and the awesome Battle Blades Optimus.