If you're more of a fan of the G1 cartoon, get the TakaraTOMY version.
If you're more of a fan of the G1 comics and you like Nel Yomtov's colours, get the TakaraTOMY limited exclusive.
If you're more of a fan of the G1 comics but you're not a fan of Yomtov's colours, get the Hasbro version.

Quote Originally Posted by Lint
Personally I love the Takara MP boxes so the choice was a no-brainer for me.
Yeah, Hasbro's boxoversized card is fail. But I'm not going to favour a toy solely on its packaging though. Also, another cool thing with the TakaraTOMY version would be the tech specs card and booklet. Hasbro's MP Grimlock just comes with a simple textless instruction sheet. Lucky for me I've read Grimlock's Japanese instructions and transformed the TakaraTOMY version before I bought the Hasbro one - plus the fact that it's not a very complex toy... but yeah... it was a weird feeling transforming an MP with textless instructions. :/