Are you worried about damage from the 2 ohm tap? It seems that trying the two options would be the way to go otherwise.
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You should try every tap on a tube amp to determine which sounds the best to you. Sometimes the best tap is not the one you would think is the best. I have 4, 8, and 16 ohm taps on my amp and whenever I get a new speaker I experiment with all the taps to see which I prefer. It is different with different types of speakers.