hi,
for cutting this argument we can analize each of them and write advantages and disadvantages.
in general i'm working with (SU) , but in some cases it is really weaker than 3ds max.
advantages of SU :
1.quick
2.easy
3.attractive work space
4.nice renders
5.supporting most of formats for importing and exporting
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disadvantages of SU :
1.weak in some aspects
2.it is useful just for modeling and you can't do other works like animations or face designing &... in it.
3.has problem in curves.
4.you can't edit the curve surfaces whatever you like.(this is the worst disadvantage).
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advantages o 3dsmax :
1.include all the designing methods .
2.perfect and accurate work space
3.perfect renders and exports
4.quick and accurate in designing curves and curve surfaces.
5.professional
6.include animations and designing faces
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disadvantages of 3dsmax :
1.takes more time
2.hard to learn
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goodluck