10th - Is there anyone even on this division besides Matsumoto and Hitsugaya? I haven't even seen a single shinigami from the 10th division, no 3rd seat/5th seat?
7th - The Yakuza?
8th - Seems the easiest since the captains mostly gone most of the times. Then you could flirt with just about everyone, but then get scolded by Nanao later.
6th - Renji makes it easy.
Divisions I would never go to
11th - Everyone's fat there.
12th - Death wish city, living bombs apply.
1st - You've got to be very discipline to get there.