I chose the Gobots because my answer is much more balanced than the two absolutes given in the poll.
Both engineering and character recognisability go hand in hand - The TF1 Movie toys nailed the balance pretty well - The Autobots were not very movie accurate (far from it) but the characters were still very much recognizable at the same time as being well engineered such as Ratchet, Bumblebee and Ironhide.