The two balancers you mentioned are considered the best available street/strip harmonic dampers on the market. I use the Fluidamper unit which along with the TCI, these two are built to stay virtually bullet proof.
From what I understand, GM makes a 'higher performance' balancer but I do not know what they call it or the part number. It may be worth checking into if you are on a budget because the better balancers will cost $300+. Have fun with your choice
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