Which method is the fastest depends on random chance but on average using a bucket to create obsidian from lava will be the fastest. Compared to the other methods it only requires some iron which is very common and thus can be found quickly. Diamonds by comparison are more rare and will thus on average take more time to find than iron. Villages are similarly rare and in a single village there may not be enough obsidian to construct a nether portal. Of course, it's possible to find diamonds or a village full of obsidian right away; so the optimal strategy would be to focus on constructing the nether portal using buckets but to switch to another method if the procedurally generated map presents you with a better opportunity.
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