What is the strongest continuation for White?

Casual Game, https://itsyourturn.com
Analysis of John Coffey vs. keith28

8 7 6 5 4 3 2 1 a b c d e f g h -1

(white to move) 1. Nf3 d5 2. d4 h6 3. c4 dxc4 4. e4 b5 5. a4 c6 6. axb5 cxb5 7. b3 e6 8. bxc4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 Bb7 11. d5 bxc4 12. Qb2 Bc8 13. Qxg7 Qf6 14. Qxf6 Nxf6 15. Nc3 Nbd7 16. dxe6 fxe6 17. Bxc4

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Pawn promotion:
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