She didn't have to think about it for all that long. She was more distracted by something that she noticed about the explanations. The other Megan had described each of the subclasses as if talking about them as something else, but had talked about the Sniper class as if she was already a member. As if that was the option she was expecting Megan to take.
And it made sense to take that one. She already had the skills of the Hacker, and had already demonstrated some of the skills that a Thief would have. She didn't want to get up close and personal with the killing. If she was going to kill people, and it made sense that she was going to have to, she'd rather do it from a distance, more impersonally. Sniper just made sense.
What didn't make sense was the system pushing her in that direction. Or taunting her. Was Other Megan trying to get her to take the obvious choice or was it trying to get her to take another one? There was clearly an ulterior motive. But what was it?