Both seem simillar... Both ok as an intro to rotary.. I thought the stealth wasnt a bad little machine! Didnt like it at all for lining but was ok for shading... The storm seems a bit better and theres an adjustable storm too which may be cool but for the money of the adjustable storm inc vat u could buy a neotat vivace or a nedz which are both amazing machines! (3.5 stroke neotat) thats just my opinion..