Are you serious right now?
In Synthesis, they live alongside everyone and they won't start the cycles again because Synthesis is what they've been trying to achieve. It's the solution to the Organic/Synthetic conflict.
In Control, Shepard controls the Reapers. Why would he commit xenocide? Tho, he could if he wanted to, but he wouldnt do it. Anyways, he would have to order the Reapers to do it, they can't do it on their own.
I'm quite serious:
Control and Synthesis both allow the Reapers to live.
And really, you expect the Catalyst,-an eons old AI that has been committing xenocide for the majority of its existence like clockwork,-to be upfront and honest about those two options?
Control basically makes Shepard the Catalyst. I'm paraphrasing, but the Catalyst says: "You will die. You will be reborn with the same values and morals, but without organic emotions."
Shepard becomes immortal, without any company. Eventually, he'll live to see organics continue making mistakes after his friends are long dead and who's to say he doesn't decide to step in and basically become a benevolent, immortal tyrant, or just become the Catalyst 2.0?
Synthesis basically Reaperises every organic in the galaxy capable of calculus, but nothing is said about what it does to the Reapers. They already are organic and synthetic hybrids. Basically, it makes the fighting stop...and it infers it doesn't do a damn thing to the Reapers, so this is basically Bad End, because it can be assumed the Reapers could still harvest everyone at some point.
Destroy suffers from the same uncertainty as to the trustworthiness of the Catalyst and proves it outright lied, because Shepard survives firing the Crucible in this ending, taking the post credit shot of Shepard breathing into account.
And the Stargazers?
It never states what became of all the races. Even for the destroy ending. It's the same during the refuse ending as well.
Hence, to my mind, Destroy is the one ending that doesn't play into the Catalyst's hands. It has the most negative consequences, but it doesn't directly destroy Shepard the way Control and Synthesis do, which both disintegrate them, to start with.
And insofar as the casualties, Garrus, EDI, Javik and Anderson all in their own ways back the Destroy ending, whereas who backs Control and Synthesis? TIM and Saren, and they were both compromised by the Reapers while they were advocating.
So, there's my reasoning as to the endings.
It's still doubtful the Catalyst told you everything regarding the consequences of Destroy,-it could just be a temporary shutdown that gives you a window to throw the Reapers into black holes for all we know,-but it's a much safer bet than Synthesis or Control.
EDIT: Now, let's get back to the main point of this topic instead of having this whole tired argument for the umpteenth time.
Anyone want to take punts on team composition?
If you take the marketing survey at face value, we're definitely getting a krogan.
But what about Caro? Liara clone, or something different?
I'm hoping she's Nyreen's replacement, but there's nothing to support or deny this, unless you take the description of what sounds like Nyreen's Biotic Protector power into account, but that's flimsy on its own.