Advantage dream meaning is explained below using 5 different sources. Each interpretation is shown with its source.

Interpretation 1 — Zolar

lucky numbers: 04-12-36-38-45-47

friends taking, of you: wil lead a life of ease.

others: smal disputes over petty investments.

people, to get money: family prosperity is in the future.

poor people: give a percentage back.

taking: future improvement in affairs.

of others: consolidation of business affairs soon.

Source: Zolar’s Book of Dreams Numbers and Lucky Days Author: Zolar

Interpretation 2 — Dream Explanations - Anonymous

If you dream that you have the advantage, then you are feeling confident, successful, and in control of your destiny. However, if you dream that someone else has the upper hand, then you are dealing with issues of inferiority and inadequacy.
Source: Strangest Dream Explanations Author: Dream Explanations - Anonymous

Interpretation 3 — Silvana Amar

Whether you took the advantage or someone took advantage of you, it is a good omen and presages family prosperity and general contentment. 
Source: The Bedside Dream Dictionary Author: Silvana Amar

Interpretation 4 — Stearn Robinson - Tom Corbett

Whether you took the advantage or someone took advantage of you, it is a good omen and presages family prosperity and general contentment
Source: The Complete Guide to Interpreting Your Dreams Author: Stearn Robinson - Tom Corbett

Interpretation 5 — Ibn Seerin

(See Booty)
Source: Islamic Dream Interpretation Author: Ibn Seerin