Drf makes a great observation. In my opinion, in stock form the 044s are stronger runners. More aggressive cylinder porting, bigger exhaust outlet and fully adjustable carb. Like drf stated though, some mods and a carb swap puts them on equal playing grounds with the added convenience of a decomp switch on the 440. To me the tank vent on the 440 is a better design than the 044 tank vent. I prefer the screw in type filler caps versus the flip caps. Why? When you go to take off the filler cap(for whatever reason) you can release pressure slowly with the screw in cap versus the flip cap which is sort of all at once.
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