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Which Clutch Fluid to Use?
You can’t go wrong by using the clutch fluid specified in your owner’s manual. That’s a GM-branded fluid. But note that GM now recommend Super DOT4 brake fluid for all Corvette clutches.

When considering alternative brands, keep in mind there is no magic fluid that prevents pedal woes. All fluids will degrade under aggressive driving and need changing regularly.

If you want an alternative to the GM-branded fluid, I’ve used Prestone brand with good results for eight years in three Z06s. That means, following the fluid change protocol with Prestone, I’ve had no clutch pedal issue. I am currently using Prestone DOT4 Synthetic in my 2006 Z06. But I have no reason to believe that my results would be different with any other good brand, so long as the protocol is followed.

If you’re running DOT3 fluid in the clutch, you ought to consider upgrading to DOT4, which is usually compatible with DOT3. But be sure to read the label on cans you’re considering. DOT4 brake fluid generally has higher dry and wet boiling points than DOT3. Given the minimal price difference between the two, it makes sense to use DOT4.