creationist tried to tell me embrology doesn't support evolution.

[Statler Waldorf]

If different methods yield different results, but the error bars overlap at some point, then there is a good chance that they are all correct.

That’s not proper reasoning at all, if all the methods underwent the same period of accelerated decay they’d all be erroneous for the same reason and therefore yield similar but erroneous results.

Human specimen is 6 feet tall and weighs 144 pounds.

Dating method 1

The specimen has grown 0.5 inches in the last year, therefore the specimen is 144 years old.

Dating method 2

The specimen has gained 1 pound in the last year, therefore the specimen is 144 years old.

According to your reasoning, since these two dating methods yield similar results they are probably correct, therefore this hypothetical Senior in high school is really 144 years old and not 18 like he claims to be.

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Are you aware that you sound very much like a muslim?
Only, they claim that same thing about their Qur'an, instead of your bible.

So, which is right? which is wrong?
How to tell?

That’s a fair enough question. I am not aware of any Muslim that makes that argument though and for good reason. According to Muslim theology, Allah transcends logic and is capable of contradictory thoughts and actions, and therefore the existence of Allah cannot account for universal, immaterial, and transcendent laws of logic. Muslims also have no direct revelation from Allah guaranteeing future regularity of natural law, thus they cannot account for induction and therefore science either. So unlike the Christian worldview, the Muslim’s view of reality cannot account for human experience and intelligibility.