I have used all three extensively and I would strongly disagree with this statement.
1. Springer - As much as I like everything else they do, their basepads are no go because of the small screw used to secure the basepads. It is a royal pain in the rear to remove the basebads to clean the mags. You need a special tool to do that and it is very easy to strip them and/or lose them.
2. With Hennings you lose 1 rds and get only 22ds in the mags vs 23 with TTI.
3. TTI is the way to go. You get +6rd and you do not need any tool to remove it.