Which blind structure is better?

[synth_floyd]

I live in Japan and there are two poker clubs that play small stakes tournaments. Usually maybe 15-20 people play in a tournament. The annoying thing is that the blind structures for both are really fast and quickly turn into an all in fest but I was wondering if you could help me figure out which structure is better.

Tournament A:
starting chips: 1500
round length: 10 min
1R 25-50
2R 50-100
3R 75-150
4R 125-250
5R 200-400
6R 300-600
7R 400-800
8R 600-1200
9R 1000-2000
10R 1500-3000
11R 2500-5000
12R 4000-8000
13R 6000-12000
14R 10000-20000
15R 15000-30000
16R 20000-40000

Tournament B:
starting chips: 2000
round length: 15 min
1 50-100
2 75-150
3 125-250
4 200-400
5 300-600
6 400-800
7 600-1200
8 900-1800
9 1500-3000
10 2500-5000
11 4000-8000
12 6000-12000
13 10000-20000
14 15000-30000

They also both allow rebuys (no addons). Tourney A is the first hour (6 rounds) and tourney B is for the first 6 rounds also (90 min). Another question, is there any point of rebuying after the first few rounds when you only get something like 2 or 3x the big blind? Also is there some kind of formula you can use to determine which blind structure is "slower?"