Well, its not easy to say, Malfoy has been quite close to the Dark Lord and for surre has learned quite a lot from him, but on the other side Lupin has also been very close to Dumbledore. Any way, I can continue analysing this for the entrire night, I wish Lupin wins, he stands a chanse if Malfoy doesn't look at the weather forecast, and Lupin turns to ...
also Lupin did work undercover with the 'Dark Side'. I Know Lupin would win for sure. Malfoy is still just an arrogant little bratty kid who thinks he knows it all. Don't get me wrong Malfoy is one of my fav Characters but before he goes up against Lupin he needs to grow up a bit and learn how to fight fair.