Inverter generating sets are smaller, mobile and lighter. Some models make less noise because the power adapts itself to the load and, therefore, consume less fuel. There is an excellent relation between the relatively small tank volume and the relatively long lifespan.
Inverter generating sets are not produced in high powers. They have a perfect sinus (voltage and frequency), that is why you don’t need an AVR (only a perfect voltage) and you won’t have any problems with electronic appliances.
Some inverter generating sets can be connected in parallel but make sure that you don’t connect more than two generating sets in parallel.