I chose the Lovense Flexer Panty Vibe.

They are both pretty different toys. The Ferri is more your traditional in underwear placed using magnet type but the Flexer is actually an insertable vibrator inside the vagina that is classed as a wearable and can used also like the wearer would use a panty vibe but with g-spot vibration in addition to just clitoral. I personally prefer the Flexer because of the fact it's a insertable/wearable that is more practical than sole use panty vibrator.