[lincpimp]

The medusa is smaller in diameter, as the case is not finned. The hacker's larger diameter may cause some fitment and gearing issues. Power wise I think they are similar. The medusa may be more effecient due to the lower kv. Plus the medusa may make more torque. Plus I know you intend to use 5s, so the medusa would be the best choice. Build quality is similar, the hacker may be nicer looking and have better exterior finish, but that does not matter for performance.