The only thing the insert bearings have going for them is that if you really need new bearings, they are cheaper, and easier to put in. Otherwise the babbit type rod is the better bearing, in my experience. The other thing babbit has going for it these days, is that if you really need to turn your crank, you only have it turned the minimal amount to clean it up. Then have your rods made to fit the crank at
Paul's Rod and Bearing. This will preserve the original material of the crank.
Give 'em a call and talk to Russ. He will give you the straight story. I hope you have kept up with the shims.
Kurt