I'd have to say both, though in the case of the movie though visual fidelity might just rate a little higher for me. Its not so much visual accuracy though as getting the movie asthetics right, the best toys do this while others fall short. I'm not a fan of the FAB Frenzy (though I don't have the Robot Replica either) While its nice how he transforms he just doesn't look like one of the movie bunch to me. I'm a big fan of the new Leader Prime and Voyager Starscream because I think they nailed the look and feel of the characters without compromising on engineering.
Ofcourse in no way does that mean I'm a fan of Movie Combiner Class Devestator. As stated before he is an extreme example. I don't think I will get him. That said I don't think I will get the TomyTakara Legends Combiner either. I'm not really all the compelled to get one of every character who appears in the movie, I'm more likely to get them if they complement the ones I already have.
Although if I get really excited........................................... ...