How do Willy's and Dave Singleton's deaths compare and contrast in Death of a Salesman?

Dave Singleman epitomised success in advertising for
Willy. He apparently lived the life that Willy hoped to emulate, and the description
which Willy gives of him is where the title from the play is
taken:

'when
he died - and by the way he died the death of a salesman, in his green velvet slippers
in the smoker of the New York, New Haven and Hartford, going in to
Boston'

There is a sad
contrast with Willy's death where the stage directions tell us of his dramatic
breakdown-

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He turns around as if to find his way;
sounds, faces, voices seem to be swarming in upon him and he flicks at them,
crying,

Just
before he drives to his death.

Also, we are told that Dave
Singleman's funeral was huge,

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'hundreds of salesman and buyers were at his
funeral'

whereas Linda asks
why there were so few people at Willy's.

We can imagine
that the character of 'Singleman' is unique and venerated in his profession, whereas
'Loman' is invisible, inferior and easily forgotten.