Could anyone tell me why one training model is so better than another one?

Hi all!

Been using TensorFlow for a short period of time and not really had much time to learn it. I managed to find code online to train TensorFlow models. But I managed to find two TensorFlow training code, but this one

Training code one: https://pastebin.com/0RKV0wBC

Seems to be a lot better than this one:

Training code two https://pastebin.com/VgVZG1bz

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The only issue with the first one is that I can only use 2 sets of images, whereas in the other code I can use as many training sets as I like

I can use the same set of training data for both codes, and the first training code gives a far better, more accurate result than the second code.

Anyone knows why?

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Thanks!