Time: 100 years from now and energy weapons have been perfected.

Location: gun show for **lethal energy weapons** for home defense

My problem is:

I have two types of energy weapons one has a removable energy cartridge/ammo that you can charge separately.

The other energy gun was designed with a non-removable cartridge/ammo for convenience (can also be charged)

Both are safe when handled by trained shooters. Both are safe from overcharging. Both designs are stable for long storage. Both designs have safety switches. The only difference is the removable cartridge/ammo design.

Which will be the biggest seller? Will more people prefer the conventional removable cartridge/ammo design or will they prefer the non-removable cartridge/ammo design?