My SCI is still a little on the low side of depth so I would probably go for Janeway, Sulan would be my second choice for gauntlet. Shinzon not great base for shuttles, mediocre for voyages, gauntlet not going to set the world alight and arena/skirmish well depends who you have but I would place it lowish on the agenda.
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Comments
Sulan is without a doubt excellent for the gauntlet if that's your thing. He's just not much good besides that.
Janeway has pretty good SCI base even at 1/5 and is halfway decent for voyages.
Shinzon is, meh. I mean he's got a nice ship ability (if you're looking for something positive), but nothing some other/better crew don't have.
You might think otherwise, but resistance is futile.