The Wahl or the Hitachi if you want high end, rumbly clitoral stimulation.
As for "high end" you don't have to pay an arm and a leg to get good, high quality power.
The Mimi couldn't get me off if I gave it an hour. Not strong enough, it may work for people with sensitive clits (if I had used toys in my 20s, for example, before peri-menopause kicked my ass and gave me a Clit O Steel) but not for those of us who need power, low frequency vibration and lots of strength.
You can't beat the Wahl or the Hitachi. Personally, I prefer the Wahl. The vibrations are lower in frequency than even the Hitachi and it is our "every time" toy. I have found NOTHING works the way the Wahl does.
But, of the ones you have listed, I'd say the Big Boss. Fun Factory is known for low frequency, rumbly vibrations and the size and shape of the Big Boss is one of the best. I have the battery operated version of this toy, that only one company was allowed to carry (sorry, it wasn't Eden) called the Boss Lady
and the toy rocks the Heavens and the Earth.