The choice should have been Hero of Ferelden x Hawke.
Just sayin'
Then everybody would be pissed because they would be forced to kill either one of their main characters. Besides, that would involve getting the HoF into the game, and that would ****** even more people, because they would have to give him/her a personality/voice that would probably be different from the personality that each player gave to his/her Warden. They already took a risk by giving an standard personality to Hawke. Plus, giving a voice to a voiceless character would probably not be the best option.
Anyway, I'm on my main playthrough, and I left Stroud without hesitation. Maybe if I had another world state in which Alistar lived I would have chosen him, but deciding between somebody I barely knew (in DA2 Carver became a templar, so I didn't met Stroud) and a character that I played as for at least 30 hours had only one possible outcome.
But...damn, that mission was awesome. Nightmare's voice was amazing, spot on. Much better fade sequence that the one in Origins (at least in my opinion)