Guys I want to Buy NovaRossi engine and I see that they have 2 engine is good

bout I don’t know what is the better so I need help to can know witch on I get and better than the anther

1st one is: Novarossi FLASH 21
2nd one is: Novarossi FLASH 21 SPECIAL "TUNED"

So please I want to know what is there better to get it

Thanks