Its still Sidious, no matter how many ways you slice it. It will always come back to Sidious. There is no "what ifs" there is no "Buts" there is no "What about?" NO, there is NOTHING that Malgus holds above Sidious.
There is one thing that Malgus has that Sidious doesnt, a respirator. But thats it, no ifs and's, or buts.