Newer is not always better. I would go for the ModWright if it was me. Their gear is fantastic and punches way above its weight for value. I'm sure the Kinki is a nice component too but I'd still go with ModWright.
Think of it this way. You can try the ModWright now, and give it a good workout in your system. If some time passes and you end up not loving it, there will almost certainly be more of the Kinki units on the second hand market by then. Probably at a lower price than they are now, being that it is a pretty new model.