We faced this same decision in 1995 when getting the Grocery Getter engines ready for almost weekly drag racing duty. I purchased 1 steel and 1 aluminum outer shell ATI damper and we went racing. After 15 years of running that car and interchangeable use of both dampers, we found no difference between the two and they were flawless. Sent them back to ATI once for rebuilds and they said they were perfect. I have seen fluid dampers leak on several occasions and Innovators West dampers certainly look cool, but seem very overcomplicated with the dozens of fasteners all over it. I have always preferred the " most simple design that works". The ATI damper fits that perfectly. A solid steel balancer is not a damper. I prefer a damper. On the funny car engines we ran a steel hub. The blower belt became the damper.
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