Which Faction would you have joined during the Nexus Uprising?

I do understand this point of view, but do not agree, as it is never working (and this is not personal, I just picked you to quote from all the people who woulod rather be neutral as well). If there is infight between two factions, you got to pick one. Because by the end, they know. When you decide to hunker down and wait, by the time it is over, the faction that won will still send you away. "You werent with us, so you are not loyal to our cause,  you are unpredictable and therefore you go." no matter whether the exiles would have won and exiled the "loyalists to the AI cause" or if the loyalists won, you will be "exiled" alongside the faction that lost. Plain and simple.

Agreed. 

Agreed. Until the Pathfinder arrived, the Nexus was thousands of people waiting to die. At least those who left could feel like they had some control of their fate. I can see benefits in either choice. It made sense that we saw this very thing, people choosing to leave, still happening in-game. It was an example of good continuity between the prequel novel and the game. That's often a rare thing.

This makes it sound like you haven't actually read the novel. There really weren't any factions, as the OP erroneously suggests. The citizens were told to stay in their quarters, or in secured locations, until the situation was handled. "Staying neutral" would've been strictly a mental exercise. You had two choices: join the overzealous rabble-rousers, or obey the authorities and wait until security handled the situation. There was no post-incident Inquisition, trying to determine individuals' feelings or leanings. Those arrested were simply exiled.

The tragedy was that most exiles were simply obnoxious protestors/rioters who didn't realize what was truly happening. They were used as pawns to distract security as the actual nut-jobs, Corvinnus and his team, behaved like terrorists. If Sloane had been present, or had the confidence in her peers to tell them her plan, she could've ended the crisis with far less tragedy. If the "terrorists" surrendered, great. If they don't, at least a huge number of people don't end up needlessly exiled.

The exile was Tann's final, miscalculated blunder, and one that made even him sick. As Cyberstrike discussed, Tann seems chastened by the time Ryder arrives. He's thankful, appreciative and eager to cooperate, even if he still overestimates his own importance, occasionally. He's not a fool. The Pathfinder is the Initiative's last chance. If Ryder fails, they return to ponderously waiting to die.

Similarly, I appreciate the development that Addison and Sloane received, too. (Sloane could've been done much better, though.) We still see some of Addison's manic, fatalistic demeanor, early. She finally climbs out of it, though, and becomes a seemingly solid Colonial Director, as Ryder achieves repeated successes. Through Sloane, we get to see just how terribly the exile affected people. They had to get very hard, savage even, in order to survive. She willingly left the Nexus to protect these people. (She'd have still been part of the Triumvirate, had she stayed. The truth of her non-involvement would've seen to it.) She did leave, though, altruistically; and now she's a benevolently ruthless pirate queen, holding Kadara Port together the hard way. She clearly bears more than physical scars by the time Ryder meets her. I wish the game had offered a more complete portrayal of Sloane. Those who don't read the novels are left in the dark.