I can't actually see the logic of saving Stroud over Hawke. Not only is Stroud meant to be close to his true calling but also the idea that he is the only one who can rebuild is a bit daft, particularly since you also have Blackwall, who you are not meant to know yet is not a real Warden (even if based on your previous knowledge you do rumble it before the game reveals it). The other disappointing part is that if you do save Stroud and let the Wardens stay in Orlais, instead of helping rebuild and providing. leadership, he immediately disappears off to the Anderfels.
I have yet to use my Alistair Warden LI to Hero Warden playthrough but that might prove to be a bit more problematic.
Really they should have made it a choice between the Hero of Ferelden and the Champion of Kirkwall; I'm pretty sure that was the original intention but then they got cold feet imagining the fan backlash. To be honest, though, this old trope of having to choose between one companion and another is getting a bit stale.