BLUF: I don't really care about what squad I'm in, and it's better to worry about the things I can control.
I'm kind of surprised this question is being asked on this forum, but I'll do my best to answer it. Positive outlook: you spend 3 years getting to know a new group of people and really bond with them. Also, a reputation of "good doolie/bad doolie" doesn't follow you, so you get a fresh start.
As for good/bad squad, I honestly don't like that question very much. Every single year, 50% of the squad is an entirely different group of people, and the culture and personality of the squad changes by that much or more. AOCs and AMTs are only around for 3 years, leading to even more variability from year to year.
Location is probably the most stable thing, but even that isn't too definitive.
Sijan pros: Sijan firstie parking when you area firstie + allegedly a small permanent party presence, and proximity to the chapel & A-hall for Sijan tower.
Vandy pros: Closer to gym, 2 deg parking, A-hall for vandy main, mailroom and C-store.
5th & 6th floors: pro: fantastic view, con: leg workout to go to the quad.
2nd & 3rd floors: just the opposite of 5th & 6th.
Me personally, I'd prefer a 3rd or 5th floor squad, and the east side of Sijan followed by Vandy tower.