You also need to take in the fact that the jaegers are human made fighting machines that are considerably larger than the largest TF we have seen so far in the 3 movies. I'm not sure where I first saw it, but there is a size chart floating around comparing the size of the jaeger Gypsy Danger to Megatron from the live action movies, latest versions of Godzilla, King Kong and Cloverfield monster and Megatron stands around the height of Gypsy Danger's ankle (if I remember correctly). Also the jaegers being much more simplistic with their armor design makes them easier and faster to repair and maintain after battles. They are made to be used in brute force, full frontal fighting with enough parts to allow them to have great power, move freely and relatively smoothly, while still being simply designed enough to make maintenance and repairs as fast and straight forward as possible to get them ready to go again with another battle. All that makes them look really human made, like engineers and scientists could come together to make them, where as the TF's look really alien and impossible to make given our current tech.