So, why we still use incinerator? 
First, for the medical waste from hospital, the pyrolytic incinerators is best treatment up to now. Pyrolytic technology can kill the virus, pollution control. 
Second, for human body, pet animal, in many countries and regions, we desire to cremation them. This is the ceremony in the process of society development, and ceremonies to commemorate the disappearance of life. 

As above two reason but not only above, we still use incinerators. 

How you can find reasonable incinerator for your local site? 
Incinerator is not a cheap equipment, generally the small scale model's price around $5, 000usd per unit and large scale model's price large-scale msw incinerator, large scale incinerator manufacturer, largestmedical incinerator design, leading manufactures of incinerator company, more than $50, 000usd per unit. So, before purchase one unit incinerator, you have to make clear following items: 
A, burn what? Incinerator is a incineration equipment, function is fire waste. So what kind of waste you want to treatment? 
B, small or large? This according to the waste output every day or the waste volume per feed time, like animal size. 
C, fuel? Incinerator use oil or gas fuel, generally, gas fuel is cheaper than oil and the smoke cleaner than oil fuel model. But some local site don't have gas supply system. 
And other technology items, like power(220v, 380v), waste feed door type, incinerator structure, etc.