The Bond is definitely smaller than a J-frame, it has it's place. I got one for my wife, when Greg 1st started making them, it's in .357 mag, and is not bad even with full house magnums. It is one of the most easy cocking derringers too, one hand no problem.
Interchangeable barrels and calibers is a +.
If you want a derringer, I would go with the Bond.