The thing I didn't like about the movie designs were how they basically part formed.
The vehicles just appeared to shatter and then reform. Not literally, they were just so complex that this is what it looked like. And the problem I have with this is how fragile it would be.
The more parts the more things that can go wrong. You could easily throw a spanner in the works while they transformed. If you were in a war for so long you'd want something that was durable and had very few exposed points.
This is why I think the Traditional style is more plausible.
I mean, alien facial features are ok, makes it interesting, but the transforming wasn't.