Would 3 antminer S3 and 1 antminer S5 do me any good here? Or would it be waste of time? They just collect dust in a box
If it's worth you running them (and that's a different question) then this pool is the one most likely to get them up to a payout because of the way it accumulates payments till they eventually get a reward. Currently since the pool is still small they would probably get a reward on the first block solved too. Make sure to use the ONE username for all of them, but feel free to use different workernames.