I would love to have you helping out in the Mersenne-Aries work. I am obsessed with p-1 testing and that is what I have both of my p4s on. The only disadvantage about doing this is that about once a week you manually have to submit results and update worktodo.ini but that only takes about a minute.
But the decision is up to you. You won't find a new prime this way but I find it more exciting than LL testing.
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