They're all similar in power, but generally the older the version the more powerful by a hair. (The 6.1 95 Classic is the most powerful of them all, due to the sheer mass.) You adjust power level by choosing strings. For example, Pro Line II for power and Pro Line X for lower power.
Whether the 6.1 95 is a "low power" frame depends on your own physical strength. For scrawny men, it's low powered. For a body builder, it's tremendously powerful. You choose a racket based on how much power YOU need, and only you know your own strength.
When their tennis really matters, Babolat Reps use a Wilson.