The consequence to man for rejecting Salvation is destruction and eternal torment. The consequence to God when man rejects salvation is momentary sorrow. Therefore, IMO, man gets the greater benefit.
Not to downplay the tremendous gift of salvation to a man. But I would have to say that God is more concerned for His Glory. If He wasn't, all men would be saved.
While we receive a great and wonderful gift in salvation, Gods first concern is His Glory. And the Cross reveals His Glory. The salvation of a man reveals the Cross, which is his Glory.
If Gods first concern and priority was the destruction and eternal consequences for a man, He would save all men. But His Glory in the cross is priority to Him, and man reveals His Glory(the cross) in that mans salvation. Thus, IMO, the advantage is to God and not the man..............But man greatly benefits(we don't have words to describe it) from revealing His Glory.