I've been running CE frame connectors ( bolt in) for at least 20 years. Have been glad they were not welded in at least a couple times. Can't say if they are better or not as good as fully welded (I suspect fully welded is as good as it gets ) but they work fine bolted in. Never had them come lose or cause any problems. My experience says bolt in. You got a welder? Are you going to have to have somebody else weld them in? Are you going to be able to take them off if you have to? Just some food for thought.