When did we stop calling him Junior? There's not even a new actual presidential candidate with the name.
Calling him "Bush 41" makes him sound more like a nu metal band than a former president.
Bush 41 is George H. W. Bush. Junior is Bush 43.
Too many fullstops to correctly parse that sentence. Or is it two? (This is why I like double spaces.)
Senior then. I guess my comment serves as evidence for why the numbering is useless for anyone not paying close attention to the sequence of US presidents.