What is the strongest continuation for Black?

Casual Game, https://itsyourturn.com
Salte_FN vs. John Coffey

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

(black to move) 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Bd3 cxd4 7. cxd4 Bd7 8. O-O Nxd4 9. Nxd4 Qxd4 10. Nc3 a6 11. Re1 Ne7 12. Be3 Qxe5 13. f4 Qd6 14. Bd2 g6 15. Ne2 Qb6+ 16. Kh1 Bg7 17. Bc3 d4 18. Bd2 Qxb2 19. Rb1 Qxa2 20. Rxb7 Qd5

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Options:
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Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight