The second one is definitely a better weapon. Smaller and more powerful.
The first one needs to have more velocity for that big of a weapon and it had several design flaws. Fuse? Your going to put an embedded fuse in there? How about a circuit breaker you can easily reset under fire. You also have to take the weapon apart to change the battery. That needs to be an external snap-on.
My question about both is range. How far will the projectile travel with enough force to be effective?
