Probably John Sherman Cooper, Thurston Morton, Cecil Underwood, B. Carroll Reece, Winthrop Rockefeller, Howard Baker Sr., Howard Baker Jr., Lamar Alexander, Bill Haslam, John Warner, Ron Paul, and maybe even Rand Paul, George H.W. Bush and Jeb Bush. On the other hand, George Wallace (he switched over to the Republican Party shortly before his death in 1998 AFAIK), Strom Thurmond, Roy Moore, Chris McDaniel, Marsha Blackburn, Jim Inhofe, Jesse Helms, James Martin (the 1962 Alabama Republican Senate Candidate and Congressman from 1965-67), Albert Watson, Tom Cotton, and Ted Cruz were the worst Southern Republicans who ever served in office.
+100. With minimal differences - exactly my opinion too...