Why Paul's Gospel?
It is the revelation from Jesus Christ.
But I certify you brethren, that the gospel which was preached of me is not after man. For I neither received it of man, neither was I taught it, but by the revelation from Jesus Christ. (Gal. 1:11,12)
It makes know the mystery which was hid from the foundations of the world.
How that by revelation he made known unto me the mystery; (as I wrote afore in few words, whereby when you read, ye may understand my knowledge in the mystery of Christ) Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the spirit. (Eph. 3:3-5)
It fulfills the word of God.
Wherefore I am made a minister, according to the dispensation of God which is given to me for you, to fulfill the word of God. Even the mystery which hath been hid from ages and from generations, but now is made manifest in his saints. (Col. 1:25,26)
It is the power of God unto salvation.
For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also the Greek. (Rom. 1:16)
The secrets of men's hearts will be judged by Jesus Christ in accordance with Paul's gospel.
In the day when God shall judge the secrets of men by Jesus Christ according to my gospel. (Rom. 2:16)
Jesus Christ establishes in accordance with Paul's gospel.
Now unto him that is of the power to stablish you according to my gospel, and the preaching of the mystery, which was kept secret since the world began. (Rom. 16:25)
It brings to light life and immortality.
But is now made manifest by the appearing of our savior Jesus Christ, who hath abolished death, and brought life and immortality to light through the gospel: (II Tim. 1:10)
Paul's gospel calls unto glory.
Wherefore he called you by our gospel, to the obtaining of the glory of our Lord Jesus Christ. (II Thes. 2:14)
We are to follow Paul.
Be ye followers of me, even as I am of Christ. (I Cor. 11:1)
Peter's and Paul's