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I have a Randall's goby, he has a great personality and holds his own. I've never had a watchman so I don't know how they usually act but I'm assuming like you said, are pretty much the same. I think it just comes down to what pair you really want for your tank.
I have a big one that looks just like yours. Gobers. He doesn't bother anything but can hold his own, for sure. Love him.
He's probably almost 4 inches long.... love him he though