Me personally I would go with the mg66, solely due to the fact that me and a bunch of guys out here in my neck of the woods have been having a lot of problems with the durability of the JS! I'm not by any means trying to flame the JS brand, We just are not having any luck with them. The engine makes awesome power, and does get the 10 min + runtimes but just not for long. The mg66 is a go based engine, and I've had go,s in the past with very little problems! Heck there's 2 mg66,s running in the worlds! Can't be that bad of an engine if there being used on that stage! Just my opinion, please don't chop my head off!