If you are looking to gain money the best job is:

Hitman - Exterminate Rival Family: Pays: $3,450,000 - $6,900,000

Enforcer - Wiretap the Cops: Pays: $2,300,000 - $4,600,000

Soldier - Museum Break In: Pays: $ 55,200 - $ 82,800

Associate - Jewelry Store Job: Pays: $ 5,750 - $ 17,250