Bike - Cogs Teeths

9Speed Cassette

12-23 -> 12-13-14-15-16-17-18-19-21-23.
12-25 -> 12-13-14-15-16-17-19-21-23-25.
12-27 -> 12-13-14-15-16-17-19-21-24-27.

Reference 12-25 vs. 11-28 cassette, opinions?