Originally Posted by SteveP

Don't take any more advice from whoever made that comment. An engine from any one of those engines (including Sirio) will last equally long if you treat them well. Only an immature fanboy would make a stupid comment like that. Having said that, don't be overly concerned about which engine you buy among those you mentioned. They're all exceptional and the right tune, clutch set-up and driving will make a much bigger difference than the subtle differences in each engine's power curve.