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At one time the amount of voltage a stun gun had was directly related to the size of the device. But with newer technology, this is no longer the case.
Today there are stun guns with upwards of 1,000,000 volts that are as small as a deck of cards.
Now an 80,000 volt Mini Talon will stop an attacker just a surely as a 975,000 volt hotshot stun gun
The main difference is the more powerful stun guns can produce a more intimidating crackling sound when fired. This alone can often stop an attacker. Also the higher voltage stun guns can cause more instant pain at the point of contact, and they tend to work a bit quicker for subduing a person. (In an attack every second can count).
So to answer your question, you should get the one that's a size you feel comfortable carrying and with the highest voltage that you can afford buy | 
