Which law was more significant to labor/management relations, the Wagner Act of 1935 or the Taft Hartley Act of 1947?

Which law was more significant to labor/management relations, the Wagner Act of 1935 or the Taft Hartley Act of 1947?

Which law was more significant to labor/management relations, the Wagner Act of 1935 or the Taft Hartley Act of 1947?