If Bioware ever decides to choose a canon ending for Mass Effect 3, which one would you prefer?

The number one problem I have with the green and blue is the reapers are still around. Destroying them prevents that.

Sovereign was just one Reaper, and he nearly succeeded. Plus remember like Reapers the Leviathans can indoctrinate people so even though there are only three(that we know of) they could very easily make a massive army to fight for them.

Yes.  Exactly.  They're pardoned for killing 200 trillion people!  I'm not okay with that.

Yes.  Exactly.  They're pardoned for killing 200 trillion people!  I'm not okay with that.

Why would they execute Shepard?  He's almost certainly going to be worshiped by most of the galaxy for stopping the Reaper threat.  He did what was asked of him.  The Reapers were stopped.  As for geth, I doubt anyone actually considered them more than a potential threat.  No one trusts AI.  Not sure how you missed that in the entire trilogy.  In fact, we even saw in the Citadel Archives that some peaceful AI (in the form of LOKI mechs) were gunned down before they even got the chance to meet the Council.  Nah, no one will try him, let alone execute him, for their destruction.

I don't know.  If we executed Nazis for their genocide are we then also killing those who did the executing?  I think not.

Reapers are war criminals.  Geth aided and abetted.  Absolute proof of that.  No one would question that, even if some knew otherwise.  As I said, people still, and probably always will, distrust AI.  So, no, I think your argument doesn't hold up.

People of every race aided and abetted the Reapers. That's kind of the Reapers' MO. Should we kill all of humanity because of Cerberus for example? Some aliens still distrust humans after all. 

*snip*

In all seriousness, I don't think I am. I'm not talking about the Reapers, I'm talking about the collateral damage that can only be called genocide. And once again you are being hypocritical. It's fine kill all of the Geth for what an indoctrinated minority did, but it is not fine to kill all of humanity on what an indoctrinated minority did. So why is it fine for Shepard to commit genocide on a race that was helping them and most of whom were innocent? If you think being who commit genocide deserve death, then by your own argument Shepard deserves death if they choose Destroy. 
And no, not killing someone doesn't mean you don't think what they did was wrong. By that logic, everyone in prison is seen as innocent since they are still alive after their crimes rather than being executed. 

What are you trying to say by referencing Hiroshima? 

Ah, figured as much. Well, in my opinion yes absolutely those on the Allies side who committed war crimes should have been tried and executed as war criminals. So since you brought a The bombings up Curtis Lemay who decided to firebomb and later nuke Japanese cities should have for the hundreds of thousands of innocent people his orders murdered.