What breed of rabbit is best for me or my children?
Rabbits are much like humans, in that each has their own disposition, characteristics, and temperament. It is nearly impossible to rubber stamp a breed as being docile, aggressive, mean, etc. It all depends on the individual animal. In most cases, if the animal is obtained at an early age (6 - 8 weeks recommended), and handled as much as possible so it becomes aware it is in no danger or jeopardy, it will become accustomed to being handled and should enjoy being held as much as you enjoy holding it.
Rabbits are timid creatures, and frighten easily. Fast movements and loud noises around them may frighten them, and if so, they may struggle or try to get away and hide. In so doing, they may scratch or occasionally nip at you, however it is being done out of fright and not aggressiveness. This should be considered if you are planning to have your rabbit around young children. You should think about your end goal with your animal, and try to decide on a breed that will be the proper size you desire. The smaller breeds seem to mature quicker, and can be introduced into breeding programs sooner than the larger breeds, if breeding is something you have considered. Naturally the smaller breeds require less pen space, and less feed.
Attending a rabbit show and seeing the various breeds, sizes, colors, speaking with breeders, etc. may be the best way to determine which breed will be best for you.